Example of a spectral fit to an RXTE observation of Her X-1 in July 1996 (cycle No. 257). The observation is centered at MJD 50 290.75 and the integration time is 31 ks for PCA and 10 ks for each of the two HEXTE clusters. Black: PCA, red: HEXTE-A, and green: HEXTE-B, respectively; top: count rate spectra; middle: residuals with respect to a fit of a continuum model; bottom: residuals with respect to a fit which includes a cyclotron line.
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