The curve fit commands store the fit into the next higher overlay curve
for the frame; e.g., if you read data into the first curve for a frame
the fit is stored in the second.
Curve fits are done after you read the data and are wiped out by the next
read.
The fit only uses the data within the *x* window.

**LL**- does a linear fit.
**LE**- does a logrithmic fit.
The following example does an exponential fit to the extended torus pressure
(which has data for 80 seconds after t0).
`Command[ ]?`__SH 55929 DE GS-PT-1S ;__`Command[ ]?`__XT 10 80__`Command[ ]?`__R SM F1 ,,__!read and smooth a bit`Command[ ]?`__LE__!exponential fit`Frame to fit[F1]?`__,__`[Fitting 876 points starting at 139]``Log Fit: Offset= 2.467E-07 Tau= 1.809E+01``Command[ ]?`__P__!plot data and overlaid fit **LP**- does a polynominal fit.
**LS**- does a special sine wave fit that is appropriate for
`RP`raw data. **LH**- lists the line fit commands.

Fri Jul 11 12:49:48 EDT 1997