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Environment variables
The environment variables must be defined before gnuplot is executed; how
to do so depends on your operating system.
FIT_LOG
changes the name (and/or path) of the file to which the fit log will be
written from the default of "fit.log" in the working directory. The default
value can be overwritten using the command set fit logfile.
FIT_SCRIPT
specifies a command that may be executed after an user interrupt. The default
is replot, but a plot or load command may be useful to display a plot
customized to highlight the progress of the fit.
Ethan Merritt
2007-03-03