If you want to create images in more than ten energy bands, you
have to create a rebinned matrix new-rmf.fits as shown in the text just above.
Then, to create images in the energy ranges defined in
the third extension of this file set
IBIS_II_ChanNum=-1
IBIS_II_inEnergyValues="/PATH-TO-THE-FILE/new-rmf.fits[3]".
The first parameter instructs the program
to use the energy boundaries specified in the second parameter.