6.1 Accumulating spectra

• accumulating a default PHA spectrum (normal form)

  the simplest form of issuing the command is
  

  accumulate spectrum [ sfile {packet} xrange xbin  {range range ...}

• accumulating a default PHA spectrum (short form)

  in the case one wishes to accumulate many spectra, one can default the kind of accumulation setting the context to spectra, after which one can issue an arbitrary number of accumulation commands in the short form (if one wishes to interleave with another kind of accumulation it is sufficient to use the the normal form
  

  xasset context s[pectrum]
  accumulate sfile [{packet} xrange xbin  {range range ...}

• accumulating a single spectrum of another quantity

  in the case one wishes to accumulate spectra for a quantity other than PHA (e.g. a BURSTLENGTH spectrum) one may set this in the environment (and reset it to PHA or to blank - which defaults to PHA - afterwards !). One can use either the normal or the short form.
  

  xasset xquantity quantity
  accumulate {spectrum} sfile {packet} xrange xbin  {range range ...}

• accumulating spectra of other quantities explicitly

  in the case one wishes to switch between interleaved accumulations of different quantities, one may set the "pseudospectra" accumulation mode, in this case one is prompted to supply the name of the quantity to be accumulated
  

  xasset accummode pseudo
  accumulate {spectrum} sfile {packet} quantity xrange xbin  {range range ...}

  to revert to the usual behaviour, reset the accumulation mode to "normal" (or to blank which defaults to "normal").

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