Program XPT-LogK is a highly modified version of Solprint, to extract and interpolate log K's at T's and P's specifed by the user.

Input files:
  Soltherm.xpt
  XPT-LogK.dat

Outupt file:
  XPT-LogK.out

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Input file XPT-LogK.dat format includes
- The first two lines reserved for a title.
- Next, a list of T and P pairs, one pair per line, separated by a blank space or comma. There is a limitation of 1000 pairs.
- Last, a list of the names of derived species, minerals, and gases with no leading blanks, one per line, and spelled exactly as they occur in Soltherm.

Known bug(s):
A very few Soltherm records that are limited to liquid-vapor saturation also do not extend to as low as 25 °C.
  These are flagged as containing format errors, and return values of 99999.999 at all conditions.