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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.
FIT_SCRIPT
specifies a command that may be executed after an user interrupt. The default is section 2.14 replot, but a section 2.10 plot or section 2.8 load command may be useful to display a plot customized to highlight the progress of the fit.
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