interpol_modeles.f 
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is a code (originates from T. Masseron) that interpolates a model atmosphere 
between MARCS model atmospheres.

First, check that you have the gnu fortran compiler (gfortran).
Secund run make to compile the code, this will produce a binary 
  read_model.mod and the executable intermarcs
Third, edit the script file and select your desired parameters.
  For the first time, do not modify anything to check the obtained results.
Four, run the script by: "$ ./script", this will produce, if you have not 
  modify the script, a file named test_marcs_4400_+0.8_-1.50.MOOG that you 
  can compare with the file in the test directory. You can do a diff to 
  check if you obtain the same values.

For the moment, I removed, the original control plot since it nedd sm 
library. I plan to add a control plot in gnuplot soon.