Reset the normalization used in correcting the background.
XSPEC> cornorm [[<data set range>...] [<cor norm>]]...
where <data set range> =:: <first data set no.>-<last data set no.>
is a range of data sets to which the correction is to be applied and <cor norm>
is the value to be used for the normalization. A decimal point (.) is used
to distinguish a correction norm from a single data set data set-range. If no
correction norm is given, then the last value input is used (the initial value
is one (1)). If no range is given, then the last single range input is
modified. (See the çorfile command.)