Control the verbosity of XSPEC.
XSPEC> chatter <chatter level> <log chatter>
where <chatter level> and <log chatter> are integer values. The initial
value for each argument is 10. Higher values will encourage XSPEC to tell the user
more, lower
values tell the user less, or make XSPEC ``quieter." <chatter level> applies
to the terminal output, while <log chatter> controls the verbosity in the
log file. Currently, the maximum chattiness is 25. Values below five should be
avoided, as they tend to make XSPEC far too obscure. Some commands may
temporarily modify the chattiness, such as the error command. A chattiness of
25 will generate a lot of debug output.