## Command FXCAL

Parameters Defaults
FXCAL offset 0
factor 1
/
CHANNELS(ch)
XNEW(xn)
ERRORS(er)
**Purpose**
Linear calibration of the x-axis.
**Example**
**
FXCAL / chan(100,200) xnew(4.5,7.6)
**
Use channels 100 and 200 corresponding to new x-values 4.5 and 7.6.

## Parameters OFFSET,FACTOR

Specifies directly the calibration polynomial coefficients.
X-values are converted according to ** xnew = xold * factor + offset **

## Parameters CHANNELS(ch), XNEW(xn), ERRORS(er)

Perform analytical least squares fit to obtain calibration coefficients.
Lists of x-, y- and (optionally) y-error-values are given by **ch**,**xn** and **er**, respectively.
The number of values in these lists must be consistent.
If the lists contain only two values each the coefficients are computed as
offset and slope of a straight line.