Fit function

   

tv$>$ fit function background definition
Prints the definition of the background-function.

tv$>$ fit function peak

tv$>$ fit function peak activate {continuous $|$ additive}
Queries the fit-function to use (see D).

tv$>$ fit function peak definition {continuous $|$ additive}
Prints the definition of the fit-function.

tv$>$ fit function peak exponent {tl $|$ tr}
Queries the exponent for the left or right tail term of the fit-function.