XSPEC User's Guide

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3.12 Breaking With Ctrl-C
Ctrl-C can be used to break out of the data, chain, error, fit, and steppar
commands. If a Ctrl-C is entered elsewhere, it will have no effect.
When a break is entered during the fitting commands (error, fit, and steppar),
the fit will proceed until the end of the current fit iteration (ie. current lambda value when
using Levenberg-Marquardt) before breaking. This is to ensure the program remains in a
stable well-defined state. Therefore on slower machines, a user may notice a slight delay
before the program actually breaks. Ctrl-C breaking is currently only implemented for
the Levenberg-Marquardt fitting method.
Breaking is implemented for the data command primarily for users who load a
large number of Type-II spectra with one data command. So if you enter
XSPEC12> data my_data{1-1000}
and decide it is taking too long to load, you can break out at any time. However,
if you do choose to break, all spectra loaded from that particular data set will be lost. For
example, if the command below is entered and a Ctrl-C is sent while the spectra from
my_data2 are loading, the 50 spectra from my_data1 will be retained while none will be
from my_data2:
XSPEC12> data my_data1{1-50} mydata2{1-50}
3.13 Customizing XSPEC
The XSPEC environment can be customized using two separate files, both of
which are searched for in the directory
$HOME/.xspec
The first file, Xspec.init contains a number of settings that control items in
XSPEC. An abridged version of this file is reproduced below.
# XSPEC Initial settings file. 07/2009
# Valid setting lines consist of two strings in the format Key: Value
# leading and trailing blanks are ignored for the key, leading
blanks/tabs ignored for
# the value. Invalid settings (no colon) are ignored, keys valid in
format but not
# implemented are simply read but not used.
#
#
# Do not modify above this line
################################################
#
# User default local model directory
# example code may be found in the source tree at:
# ${PATH_TO_SRC}/src/XSModel/Model/LocalModelTemplate