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The result is the saturation _ mixing _ ratio  in kg/kg units. On error  nil is returned.

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• • profile: the result of a vertical profile extraction from GRIB or BUFR with the thermo_grib() or thermo_bufr() functions (see Thermo Data )., respectively.

There are four different modes to specify the a parcel's start_condition  (as a definition):

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• • path: the path of the parcel. It is itself a definition with two members: t and p, each containing a list of values.
  • area: the positive and negative buoyancy areas between the parcel path and the profile. It is a list of definitions describing the areas.
  • cape: the value of the CAPE (Convective Available Potential Energy)  (J/kg)
  • cin: value the CIN (Convective Inhibition) (J/kg)
  • lcl: the Lifted Condensation Level. It is a definition with two members: t and p. If no LCL exists it is set to nil.
  • lfc: the Level of Free Convention. It is a definition with two members: t and p. If no LFC exists it is set to nil.
  • el: the Equilibrium Level. It is a definition with two members: t and p. If no EL exists it is set to nil.
  • top: the Cloud Top Level. It is a definition with two members: t and p. If no TOP exists it is set to nil.
  • start: the start conditions of the parcel with four members: mode, t, td and p.