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Selecting data ranges

The user is initially asked to define a source box in celestial coordinates. This may be either a circular or rectangular box centred at a particular RA and DEC. Most of the calibration data is defined assuming a circular source box so ordinarily if a time series or spectrum of a point source is being produced the source box should be circular.

The data may then be further subsetted on any of the following five data properties, X detector coord, Y detector coord, time, uncorrected pulse height channel or corrected pulse height channel. The default ranges of these five properties are shown initially and the user is invited to enter the codes of the ranges to be changed.

NB: X and Y detector coordinates and uncorrected pulse height spectra are present for diagnostic purposes only. The full range of these properties would ordinarily be used when sorting the raw data.

The commands XRTBOX and XRTBCKBOX may be of use in selecting source and background box positions

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