Once a data file has been created and ISIS has been started the data can be loaded into ISIS,
isis>load_data("acisf1235_000N001_pha2.fits");
which results in
Reading: ............ *** invalid uncertainties replaced Current Spectrum List: id instrument m prt src use/nbins A totcts exp(ksec) clr target 1 HETG-ACIS -3 1 1 6972/ 6972 - 6.1000e+01 15.800 - CAPELLA 2 HETG-ACIS -2 1 1 6972/ 6972 - 1.1100e+02 15.800 - CAPELLA 3 HETG-ACIS -1 1 1 6972/ 6972 - 3.0010e+03 15.800 - CAPELLA 4 HETG-ACIS 1 1 1 6972/ 6972 - 2.5470e+03 15.800 - CAPELLA 5 HETG-ACIS 2 1 1 6972/ 6972 - 1.1300e+02 15.800 - CAPELLA 6 HETG-ACIS 3 1 1 6972/ 6972 - 6.3000e+01 15.800 - CAPELLA 7 HETG-ACIS -3 2 1 6972/ 6972 - 6.1400e+02 15.800 - CAPELLA 8 HETG-ACIS -2 2 1 6972/ 6972 - 8.8900e+02 15.800 - CAPELLA 9 HETG-ACIS -1 2 1 6972/ 6972 - 1.3810e+04 15.800 - CAPELLA 10 HETG-ACIS 1 2 1 6972/ 6972 - 8.1050e+03 15.800 - CAPELLA 11 HETG-ACIS 2 2 1 6972/ 6972 - 3.6200e+02 15.800 - CAPELLA 12 HETG-ACIS 3 2 1 6972/ 6972 - 2.4800e+02 15.800 - CAPELLA Integer_Type[12]being output to the screen. In this example we have both the HEG spectra, prt 1, and the MEG spectra, prt 2, for orders -3,-2,-1,1,2,3.