Figure A: The result of the command plot data when the data file in question is the EXOSAT ME spectrum of the 6-s X-ray pulsar 1E1048.1-5937 available from the HEASARC on-line service. The axes, labels etc. have not been modified.
Figure B: The result of the command plot data after the command ignore bad on the EXOSAT ME spectrum 1E1048.1-5937.
Figure C: The result of the command plot data with: the ME data file from 1E1048.1-5937; ``bad" and negative channels ignored; the best-fitting absorbed power-law model; the residuals of the fit
Figure D: As for Figure C, but the model is the best-fitting absorbed black body. Note the wave-like shape of the residuals which indicates how poor the fit is, i.e. that the continuum is obviously not a black body.
Figure E: As for Figure C & D, but the model is the best-fitting power law with the absorption fixed at the Galactic value. Under the assumptions that the absorption really is the same as the 21-cm value and that the continuum really is a power law, this plot provides some indication of what other components might be added to the model to improve the fit.
Figure F: The result of the command plot model in the case of the ME data file from 1E1048.1-5937. Here, the model is the best-fitting combination of power law, black body and fixed Galactic absorption. The three lines show the two continuum components (absorbed to the same degree) and their sum.
Figure G: A simulated ASCA SIS spectrum of NGC 4472 produced to show how a plot can be modified by the user.
