The total number of model parameters for the example is four.
XSPEC> newpar 2 0.1 ! The value of the second parameter is set to
0.1.
XSPEC> newpar 3 ! The program will prompt for a specification
for the 3rd parameter,
0.001,0 ! which has its value set to 0.001 and its
delta set to zero, fixing it in later
fits. The program now prompts for a
specification for the 4th parameter,
21 ! which is set to 21. As there is no 5th
parameter, the program displays a
summary and returns to command level.
XSPEC> newpar ,,.001 ! The value of the delta of the 3rd parameter
(which is the default index as it was
the first parameter modified in the
previous newpar invocation) is set
to 0.001, allowing it to be adjusted
during any fits.
XSPEC> newpar 0 ! No parameters are modified, but a summary
of the current parameter values will be
printed.
The total number of parameters for this example is six.
XSPEC> newpar 4 = 1 ! The value of parameter 4 is set to the
value of parameter 1. This has the
consequence of model parameter 4 being frozen
at the value of parameter 1 during subsequent
fitting procedures. If model parameter 1 is a
free parameter, then both parameters 1 and 4
change their values simultaneously in the
fit procedure.
Note the spaces around the ``=" sign!
XSPEC> newpar 4 = 1 0.9 ! The value of parameter 4 is set to 0.9
times the value of parameter 1.
XSPEC> newpar 6 = 3 .1 ! The value of parameter 6 is set to 0.1
times the value of parameter 3.
XSPEC> thaw 6 ! Makes parameter 6 independent of parameter 3
and a free parameter.