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Contents.m
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% GSW Oceanographic Toolbox
% Version 3.05 (R2012a) 8-May-2015
%
% documentation set
% gsw_front_page - front page to the GSW Oceanographic Toolbox
% gsw_check_functions - checks that all the GSW functions work correctly
% gsw_demo - demonstrates many GSW functions and features
% gsw_ver - displays the GSW version number
% gsw_licence - creative commons licence for the GSW Oceanographic Toolbox
%
% Practical Salinity (SP), PSS-78
% gsw_SP_from_C - Practical Salinity from conductivity, C (inc. for SP < 2)
% gsw_C_from_SP - conductivity, C, from Practical Salinity (inc. for SP < 2)
% gsw_SP_from_R - Practical Salinity from conductivity ratio, R (inc. for SP < 2)
% gsw_R_from_SP - conductivity ratio, R, from Practical Salinity (inc. for SP < 2)
% gsw_SP_salinometer - Practical Salinity from a laboratory salinometer (inc. for SP < 2)
% gsw_SP_from_SK - Practical Salinity from Knudsen Salinity
%
% Absolute Salinity (SA), Preformed Salinity (Sstar) and Conservative Temperature (CT)
% gsw_SA_from_SP - Absolute Salinity from Practical Salinity
% gsw_Sstar_from_SP - Preformed Salinity from Practical Salinity
% gsw_CT_from_t - Conservative Temperature from in-situ temperature
%
% Absolute Salinity - Conservative Temperature plotting function
% gsw_SA_CT_plot - function to plot Absolute Salinity - Conservative Temperature
% profiles on the SA-CT diagram, including the freezing line
% and selected potential density contours
%
% other conversions between temperatures, salinities, pressure and height
% gsw_deltaSA_from_SP - Absolute Salinity Anomaly from Practical Salinity
% gsw_SA_Sstar_from_SP - Absolute Salinity & Preformed Salinity from Practical Salinity
% gsw_SR_from_SP - Reference Salinity from Practical Salinity
% gsw_SP_from_SR - Practical Salinity from Reference Salinity
% gsw_SP_from_SA - Practical Salinity from Absolute Salinity
% gsw_Sstar_from_SA - Preformed Salinity from Absolute Salinity
% gsw_SA_from_Sstar - Absolute Salinity from Preformed Salinity
% gsw_SP_from_Sstar - Practical Salinity from Preformed Salinity
% gsw_pt_from_CT - potential temperature from Conservative Temperature
% gsw_t_from_CT - in-situ temperature from Conservative Temperature
% gsw_CT_from_pt - Conservative Temperature from potential temperature
% gsw_pot_enthalpy_from_pt - potential enthalpy from potential temperature
% gsw_pt_from_t - potential temperature
% gsw_pt0_from_t - potential temperature with a reference pressure of zero dbar
% gsw_t_from_pt0 - in-situ temperature from potential temperature with p_ref = 0 dbar
% gsw_t90_from_t48 - ITS-90 temperature from IPTS-48 temperature
% gsw_t90_from_t68 - ITS-90 temperature from IPTS-68 temperature
% gsw_z_from_p - height from pressure
% gsw_p_from_z - pressure from height
% gsw_z_from_depth - height from depth
% gsw_depth_from_z - depth from height
% gsw_Abs_Pressure_from_p - Absolute Pressure,P, from pressure, p
% gsw_p_from_Abs_Pressure - pressure, p, from Absolute Pressure, P
% gsw_entropy_from_CT - entropy from Conservative Temperature
% gsw_CT_from_entropy - Conservative Temperature from entropy
% gsw_entropy_from_pt - entropy from potential temperature
% gsw_pt_from_entropy - potential temperature from entropy
% gsw_entropy_from_t - entropy from in-situ temperature
% gsw_t_from_entropy - in-situ temperature from entropy
% gsw_adiabatic_lapse_rate_from_CT - adiabatic lapse rate from Conservative Temperature
% gsw_adiabatic_lapse_rate_from_t - adiabatic lapse rate from in-situ temperature
% gsw_molality_from_SA - molality of seawater
% gsw_ionic_strength_from_SA - ionic strength of seawater
%
% specific volume, density and enthalpy
% gsw_specvol - specific volume
% gsw_alpha - thermal expansion coefficient with respect to CT
% gsw_beta - saline contraction coefficient at constant CT
% gsw_alpha_on_beta - alpha divided by beta
% gsw_specvol_alpha_beta - specific volume, thermal expansion & saline contraction coefficients
% gsw_specvol_first_derivatives - first derivatives of specific volume
% gsw_specvol_second_derivatives - second derivatives of specific volume
% gsw_specvol_first_derivatives_wrt_enthalpy - first derivatives of specific volume
% gsw_specvol_second_derivatives_wrt_enthalpy - second derivatives of specific volume
% gsw_specvol_anom - specific volume anomaly
% gsw_specvol_anom_standard - specific volume anomaly
% gsw_rho - in-situ density and potential density
% gsw_rho_alpha_beta - in-situ density, thermal expansion & saline contraction coefficients
% gsw_rho_first_derivatives - first derivatives of density
% gsw_rho_first_derivatives - first derivatives of density
% gsw_rho_second_derivatives - second derivatives of density
% gsw_rho_first_derivatives_wrt_enthalpy - first derivatives of density
% gsw_rho_second_derivatives_wrt_enthalpy - second derivatives of density
% gsw_sigma0 - sigma0 with reference pressure of 0 dbar
% gsw_sigma1 - sigma1 with reference pressure of 1000 dbar
% gsw_sigma2 - sigma2 with reference pressure of 2000 dbar
% gsw_sigma3 - sigma3 with reference pressure of 3000 dbar
% gsw_sigma4 - sigma4 with reference pressure of 4000 dbar
% gsw_cabbeling - cabbeling coefficient
% gsw_thermobaric - thermobaric coefficient
% gsw_enthalpy - enthalpy
% gsw_enthalpy_diff - difference of enthalpy between two pressures
% gsw_dynamic_enthalpy - dynamic enthalpy
% gsw_enthalpy_first_derivatives - first derivatives of enthalpy
% gsw_enthalpy_second_derivatives - second derivatives of enthalpy
% gsw_sound_speed - sound speed (approximate, with r.m.s. error of 0.067 m/s)
% gsw_kappa - isentropic compressibility
% gsw_internal_energy - internal energy
% gsw_internal_energy_first_derivatives - first derivatives of internal energy
% gsw_internal_energy_second_derivatives - second derivatives of internal energy
% gsw_CT_from_enthalpy - Conservative Temperature from enthalpy
% gsw_SA_from_rho - Absolute Salinity from density
% gsw_CT_from_rho - Conservative Temperature from density
% gsw_CT_maxdensity - Conservative Temperature of maximum density of seawater
%
% vertical stability
% gsw_Nsquared - buoyancy (Brunt-Vaisala) frequency squared (N^2)
% gsw_Turner_Rsubrho - Turner angle & Rsubrho
% gsw_IPV_vs_fNsquared_ratio - ratio of the vertical gradient of potential density
% (with reference pressure, p_ref), to the vertical
% gradient of locally-referenced potential density
%
% geostrophic streamfunctions, acoustic travel time and geostrophic velocity
% gsw_geo_strf_dyn_height - dynamic height anomaly
% gsw_geo_strf_dyn_height_pc - dynamic height anomaly for piecewise constant profiles
% gsw_geo_strf_isopycnal - approximate isopycnal geostrophic streamfunction
% gsw_geo_strf_isopycnal_pc - approximate isopycnal geostrophic streamfunction for
% piecewise constant profiles
% gsw_geo_strf_Montgomery - Montgomery geostrophic streamfunction
% gsw_geo_strf_Cunningham - Cunningham geostrophic streamfunction
% gsw_geo_strf_steric_height - dynamic height anomaly divided by 9.7963 m s^-2
% gsw_travel_time - acoustic travel time
% gsw_geostrophic_velocity - geostrophic velocity
%
% neutral versus isopycnal slopes and ratios
% gsw_isopycnal_slope_ratio - ratio of the slopes of isopycnals on the SA-CT diagram
% for p & p_ref
% gsw_isopycnal_vs_ntp_CT_ratio - ratio of the gradient of Conservative Temperature
% in a potential density surface to that in the neutral
% tangent plane
% gsw_ntp_pt_vs_CT_ratio - ratio of gradients of potential temperature &
% Conservative Temperature in a neutral tangent plane
% (i.e. in a locally-referenced potential density surface)
%
% derivatives of entropy, CT and pt
% gsw_CT_first_derivatives - first derivatives of Conservative Temperature
% gsw_CT_second_derivatives - second derivatives of Conservative Temperature
% gsw_entropy_first_derivatives - first derivatives of entropy
% gsw_entropy_second_derivatives - second derivatives of entropy
% gsw_pt_first_derivatives - first derivatives of potential temperature
% gsw_pt_second_derivatives - second derivatives of potential temperature
%
% seawater and ice properties at the freezing temperature
% gsw_CT_freezing_poly - Conservative Temperature freezing temperature of seawater (polynomial)
% gsw_t_freezing - in-situ freezing temperature of seawater
% gsw_t_freezing_poly - in-situ freezing temperature of seawater (polynomial)
% gsw_pot_enthalpy_ice_freezing - potential enthalpy of ice at which seawater freezes
% gsw_pot_enthalpy_ice_freezing_poly - potential enthalpy of ice at which seawater freezes (polynomial)
% gsw_SA_freezing_from_CT - Absolute Salinity of seawater at the freezing point (for given CT)
% gsw_SA_freezing_from_CT_poly - Absolute Salinity of seawater at the freezing point (for given CT) (polynomial)
% gsw_SA_freezing_from_t - Absolute Salinity of seawater at the freezing point (for given t)
% gsw_SA_freezing_from_t_poly - Absolute Salinity of seawater at the freezing point (for given t) (polynomial)% gsw_pressure_freezing_CT - pressure of seawater at the freezing temperature (for given CT)
% gsw_CT_freezing_first_derivatives - first derivatives of Conservative Temperature freezing temperature of seawater
% gsw_CT_freezing_first_derivatives_poly - first derivatives of Conservative Temperature freezing temperature of seawater (polynomial)
% gsw_t_freezing_first_derivatives first - derivatives of in-situ freezing temperature of seawater
% gsw_t_freezing_first_derivatives_poly - first derivatives of in-situ freezing temperature of seawater (polynomial)
% gsw_pot_enthalpy_ice_freezing_first_derivatives - first derivatives o fpotential enthalpy of ice at which seawater freezes
% gsw_pot_enthalpy_ice_freezing_first_derivatives_poly - first derivatives of potential enthalpy of ice at which seawater freezes (polynomial)% gsw_t_freezing_first_derivatives - first derivatives of in-situ freezing temperature of seawater
% gsw_latentheat_melting - latent heat of melting of ice into seawater (isobaric melting enthalpy)
%
% thermodynamic interaction between ice and seawater
% gsw_melting_ice_SA_CT_ratio - SA to CT ratio when ice melts in seawater
% gsw_melting_ice_SA_CT_ratio_poly - SA to CT ratio when ice melts in seawater
% gsw_melting_ice_equilibrium_SA_CT_ratio - SA to CT ratio when ice melts into seawater near equilibrium
% gsw_melting_ice_equilibrium_SA_CT_ratio_poly - SA to CT ratio when ice melts into seawater near equilibrium
% gsw_ice_fraction_to_freeze_seawater - ice mass fraction to freeze seawater
% gsw_melting_ice_into_seawater - SA and CT when ice melts in seawater
% gsw_frazil_ratios_adiabatic - ratios of SA, CT and P changes during frazil ice formation
% gsw_frazil_ratios_adiabatic_poly - ratios of SA, CT and P changes during frazil ice formation
% gsw_frazil_properties - SA, CT & ice mass fraction from bulk SA & bulk enthalpy
% gsw_frazil_properties_potential - SA, CT & ice fraction from bulk SA & bulk potential enthalpy
% gsw_frazil_properties_potential_poly - SA, CT & ice fraction from bulk SA & bulk potential enthalpy (poly)
%
% thermodynamic interaction between sea ice and seawater
% gsw_melting_seaice_SA_CT_ratio - SA to CT ratio when sea ice melts in seawater
% gsw_melting_seaice_SA_CT_ratio - SA to CT ratio when sea ice melts in seawater (poly)
% gsw_melting_seaice_equilibrium_SA_CT_ratio - SA to CT ratio when sea ice melts into seawater equilibrium
% gsw_melting_seaice_equilibrium_SA_CT_ratio_poly - SA to CT ratio when sea ice melts into seawater equilibrium (poly)
% gsw_melting_seaice_into_seawater - SA and CT when sea ice melts in seawater
% gsw_seaice_fraction_to_freeze_seawater - sea ice mass fraction to freeze seawater
%
% thermodynamic properties of ice Ih
% gsw_rho_ice - in-situ density of ice
% gsw_alpha_wrt_t_ice - thermal expansion coefficient of ice with respect to in-situ temperature
% gsw_specvol_ice - specific volume of ice
% gsw_pressure_coefficient_ice - pressure coefficient of ice
% gsw_sound_speed_ice - sound speed of ice (compression waves)
% gsw_kappa_ice - isentropic compressibility of ice
% gsw_kappa_const_t_ice - isothermal compressibility of ice
% gsw_internal_energy_ice - internal energy of ice
% gsw_enthalpy_ice - enthalpy of ice
% gsw_entropy_ice - entropy of ice
% gsw_cp_ice - isobaric heat capacity of ice
% gsw_chem_potential_water_ice - chemical potential of water in ice
% gsw_Helmholtz_energy_ice - Helmholtz energy of ice
% gsw_adiabatic_lapse_rate_ice - adiabatic lapse rate of ice
% gsw_pt0_from_t_ice - potential temperature of ice with reference pressure of 0 dbar
% gsw_pt_from_t_ice - potential temperature of ice
% gsw_t_from_pt0_ice - in-situ temperature from potential temperature of ice with p_ref of 0 dbar
% gsw_t_from_rho_ice - in-situ temperature from density of ice
% gsw_pot_enthalpy_from_pt_ice - potential enthalpy from potential temperature of ice
% gsw_pt_from_pot_enthalpy_ice - potential temperature from potential enthalpy of ice
% gsw_pot_enthalpy_from_pt_ice_poly - potential enthalpy from potential temperature of ice (polynomial)
% gsw_pt_from_pot_enthalpy_ice_poly - potential temperature from potential enthalpy of ice (polynomial)
% gsw_pot_enthalpy_from_specvol_ice - potential enthalpy from specific volume of ice
% gsw_specvol_from_pot_enthalpy_ice - specific volume from potential enthalpy of ice
% gsw_pot_enthalpy_from_specvol_ice_poly - potential enthalpy from specific volume of ice (polynomial)
% gsw_specvol_from_pot_enthalpy_ice_poly - specific volume from potential enthalpy of ice (polynomial)
%
% isobaric evaporation enthalpy
% gsw_latentheat_evap_CT - latent heat of evaporation of water from seawater (isobaric
% evaporation enthalpy) with CT as input temperature
% gsw_latentheat_evap_t - latent heat of evaporation of water from seawater (isobaric
% evaporation enthalpy) with in-situ temperature, t, as input
%
% Planet Earth properties
% gsw_f - Coriolis parameter
% gsw_grav - gravitational acceleration
% gsw_distance - spherical earth distance between points in the ocean
%
% TEOS-10 constants
% gsw_T0 - Celcius zero point; 273.15 K
% gsw_P0 - one standard atmosphere; 101 325 Pa
% gsw_SSO - Standard Ocean Reference Salinity; 35.165 04 g/kg
% gsw_uPS - unit conversion factor for salinities; (35.165 04/35) g/kg
% gsw_cp0 - the "specific heat" for use with CT; 3991.867 957 119 63 (J/kg)/K
% gsw_C3515 - conductivity of SSW at SP=35, t_68=15, p=0; 42.9140 mS/cm
% gsw_SonCl - ratio of SP to Chlorinity; 1.80655 (g/kg)^-1
% gsw_valence_factor - valence factor of sea salt; 1.2452898
% gsw_atomic_weight - mole-weighted atomic weight of sea salt; 31.4038218... g/mol
%
% dissolved gasses
% gsw_Arsol - argon solubility from SA and CT
% gsw_Arsol_SP_pt - argon solubility from SP and pt
% gsw_Hesol - helium solubility from SA and CT
% gsw_Hesol_SP_pt - helium solubility from SP and pt
% gsw_Krsol - krypton solubility from SA and CT
% gsw_Krsol_SP_pt - krypton solubility from SP and pt
% gsw_N2Osol - nitrous oxide solubility from SA and CT
% gsw_N2Osol_SP_pt - nitrous oxide solubility from SP and pt
% gsw_N2sol - nitrogen solubility from SA and CT
% gsw_N2sol_SP_pt - nitrogen solubility from SP and pt
% gsw_Nesol - neon solubility from SA and CT
% gsw_Nesol_SP_pt - neon solubility from SP and pt
% gsw_O2sol - oxygen solubility from SA and CT
% gsw_O2sol_SP_pt - oxygen solubility from SP and pt
%
% specific volume, density and enthalpy in terms of CT, based on the exact Gibbs function
% gsw_specvol_CT_exact - specific volume
% gsw_alpha_CT_exact - thermal expansion coefficient with respect to CT
% gsw_beta_CT_exact - saline contraction coefficientat constant CT
% gsw_alpha_on_beta_CT_exact - alpha divided by beta
% gsw_specvol_alpha_beta_CT_exact - specific volume, thermal expansion & saline contraction coefficients
% gsw_specvol_first_derivatives_CT_exact - first derivatives of rho
% gsw_specvol_second_derivatives_CT_exact - second derivatives of specific volume
% gsw_specvol_first_derivatives_wrt_enthalpy_CT_exact - first derivatives of specific volume with respect to enthalpy
% gsw_specvol_second_derivatives_wrt_enthalpy_CT_exact - second derivatives of specific volume with respect to enthalpy
% gsw_specvol_anom_CT_exact - specific volume anomaly
% gsw_specvol_anom_standard_CT_exact - specific volume anomaly relative to SSO & 0C
% gsw_rho_CT_exact - in-situ density and potential density
% gsw_rho_alpha_beta_CT_exact - in-situ density, thermal expansion & saline contraction coefficient
% gsw_rho_first_derivatives_CT_exact - first derivatives of density
% gsw_rho_second_derivatives_CT_exact - second derivatives of density
% gsw_rho_first_derivatives_wrt_enthalpy_CT_exact - first derivatives of density with respect to enthalpy
% gsw_rho_second_derivatives_wrt_enthalpy_CT_exact - second derivatives of density with respect to enthalpy
% gsw_sigma0_CT_exact - sigma0 with reference pressure of 0 dbar
% gsw_sigma1_CT_exact - sigma1 with reference pressure of 1000 dbar
% gsw_sigma2_CT_exact - sigma2 with reference pressure of 2000 dbar
% gsw_sigma3_CT_exact - sigma3 with reference pressure of 3000 dbar
% gsw_sigma4_CT_exact - sigma4 with reference pressure of 4000 dbar
% gsw_cabbeling_CT_exact - cabbeling coefficient
% gsw_thermobaric_CT_exact - thermobaric coefficient
% gsw_enthalpy_CT_exact - enthalpy
% gsw_enthalpy_diff_CT_exact - difference of enthalpy between two pressures
% gsw_dynamic_enthalpy_CT_exact - dynamic enthalpy
% gsw_enthalpy_first_derivatives_CT_exact - first derivatives of enthalpy
% gsw_enthalpy_second_derivatives_CT_exact - second derivatives of enthalpy
% gsw_sound_speed_CT_exact - sound speed
% gsw_kappa_CT_exact - isentropic compressibility
% gsw_internal_energy_CT_exact - internal energy
% gsw_internal_energy_first_derivatives_CT_exact - first derivatives of internal energy
% gsw_internal_energy_second_derivatives_CT_exact - second derivatives of internal energy
% gsw_CT_from_enthalpy_exact - Conservative Temperature from enthalpy
% gsw_SA_from_rho_CT_exact - Absolute Salinity from density
% gsw_CT_from_rho_exact - Conservative Temperature from density
% gsw_CT_maxdensity_exact - Conservative Temperature of maximum density of seawater
%
% Laboratory functions, for use with densimeter measurements
% gsw_SA_from_rho_t_exact - Absolute Salinity from density
% gsw_deltaSA_from_rho_t_exact - Absolute Salinity Anomaly from density
% gsw_rho_t_exact - in-situ density
%
% basic thermodynamic properties in terms of in-situ t, based on the exact Gibbs function
% gsw_specvol_t_exact - specific volume
% gsw_alpha_wrt_CT_t_exact - thermal expansion coefficient with respect to
% Conservative Temperature.
% gsw_alpha_wrt_pt_t_exact - thermal expansion coefficient with respect to
% potential temperature
% gsw_alpha_wrt_t_exact - thermal expansion coefficient with respect to
% in-situ temperature
% gsw_beta_const_CT_t_exact - saline contraction coefficient at constant
% Conservative Temperature.
% gsw_beta_const_pt_t_exact - saline contraction coefficient at constant
% potential temperature
% gsw_beta_const_t_exact - saline contraction coefficient at constant
% in-situ temperature
% gsw_specvol_anom_t_exact - specific volume anomaly
% gsw_rho_t_exact - in-situ density
% gsw_pot_rho_t_exact - potential density
% gsw_sigma0_pt0_exact - sigma0 from pt0 with reference pressure of 0 dbar
% gsw_enthalpy_t_exact - enthalpy
% gsw_dynamic_enthalpy_t_exact - dynamic enthalpy
% gsw_CT_first_derivatives_wrt_t_exact first - derivatives of Conservative Temperature with respect to t
% gsw_enthalpy_first_derivatives_wrt_t_exact - first derivatives of enthalpy with respect to t
% gsw_sound_speed_t_exact - sound speed
% gsw_kappa_t_exact - isentropic compressibility
% gsw_kappa_const_t_exact - isothermal compressibility
% gsw_internal_energy_t_exact - internal energy
% gsw_SA_from_rho_t_exact - Absolute Salinity from density
% gsw_t_from_rho_exact - in-situ temperature from density
% gsw_t_maxdensity_exact - in-situ temperature of maximum density of seawater
% gsw_cp_t_exact - isobaric heat capacity
% gsw_isochoric_heat_cap_t_exact - isochoric heat capacity
% gsw_chem_potential_relative_t_exact - relative chemical potential
% gsw_chem_potential_water_t_exact - chemical potential of water in seawater
% gsw_chem_potential_salt_t_exact - chemical potential of salt in seawater
% gsw_Helmholtz_energy_t_exact - Helmholtz energy
% gsw_osmotic_coefficient_t_exact - osmotic coefficient of seawater
% gsw_osmotic_pressure_t_exact - osmotic pressure of seawater
%
% Library functions of the GSW toolbox (internal functions; not intended to be called by users)
% (The GSW functions above call the following library functions.)
% gsw_gibbs - the TEOS-10 Gibbs function and its derivatives
% gsw_gibbs_ice - the TEOS-10 Gibbs function of ice and its derivatives
% gsw_SAAR - Absolute Salinity Anomaly Ratio (excluding the Baltic Sea)
% gsw_Fdelta - ratio of Absolute to Preformed Salinity, minus 1
% gsw_deltaSA_atlas - Absolute Salinity Anomaly atlas value (excluding the Baltic Sea)
% gsw_SA_from_SP_Baltic - Calculates Absolute Salinity in the Baltic Sea
% gsw_SP_from_SA_Baltic - Calculates Practical Salinity in the Baltic Sea
% gsw_infunnel - "oceanographic funnel" check for the 75-term equation
% gsw_entropy_part - entropy minus the terms that are a function of only SA
% gsw_entropy_part_zerop - entropy_part evaluated at 0 dbar
% gsw_interp_ref_cast - linearly interpolates the reference cast
% gsw_linear_interp_SA_CT - linearly interpolates (SA,CT,p) to the desired p
% gsw_rr68_interp_SA_CT - Reininger & Ross (1968) interpolation of (SA,CT,p) to the desired p% gsw_gibbs_pt0_pt0 - gibbs(0,2,0,SA,t,0)
% gsw_gibbs_pt0_pt0 - gibbs(0,2,0,SA,t,0)
% gsw_gibbs_ice_part_t - part of gibbs_ice(1,0,t,p)
% gsw_gibbs_ice_pt0 - part of gibbs_ice(1,0,pt0,0)
% gsw_specvol_SSO_0 - specvol(35.16504,0,p)
% gsw_enthalpy_SSO_0 - enthalpy(35.16504,0,p)
% gsw_Hill_ratio_at_SP2 - Hill ratio at a Practical Salinity of 2
%
% The GSW data set.
% gsw_data_v3_0 - This file contains:
% (1) the global data set of Absolute Salinity Anomaly Ratio,
% (2) the global data set of Absolute Salinity Anomaly Ref.,
% (3) a reference cast (for the isopycnal streamfunction),
% (4) two reference casts that are used by gsw_demo
% (5) three vertical profiles of (SP, t, p) at known long & lat, plus
% the outputs of all the GSW functions for these 3 profiles, and
% the required accuracy of all these outputs.
%