Added option to peg all the power-law models (ie powerlaw, bknpow, bkn2pow, cutoffpl) in the same way that the pegged power-law operates. If POW_EMIN and POW_EMAX are set (using xset) then all these models will have their normalizations adjusted to be the flux in (POW_EMIN,POW_EMAX) in units of 1e-12 erg/cm2/s or, if POW_EMIN=POW_EMAX, the flux density at POW_EMIN in units of micro-Jy.
A couple of things to watch out for are : POW_EMIN and POW_EMAX should lie within the energy range being calculated; the xset command doesn't automatically update the model so either POW_EMIN or POW_EMAX should be set before defining the model or a parameter value should be changed immediately after the xset.
These changes will be included in the next heasoft release.
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