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Two-Temperature Raymond Model

**The model is a two-temperature Raymond thermal
spectrum, low temperature range is 0.55 to 0.65 keV, high temperature
range is 1 to 2 keV, element abundance table
is cosmic, abundance of heavy elements
(atomic number **>2**) is 50% of the value in the
table. Note that 0.7 = log(5.0), specifies that the second
component normalization will be 5 times the normalization of the
first component. A multiple component fit requires that this
normalization (or a range of normalizations) be specified for the 2nd,
3rd, etc. components. Type
***help models_spectral* for a list of possible choices.

xs> fit
Performing the simplex minimization fit.
Observed spectrum: rp90
Model descriptor: abs(20)*(ray(0.55:0.65 c 50)+ray(0.7 1:2 c 50)) # The free
# parameters are now 2 temperatures and one normalization.
# Note that IRAF will not accept .7 as a valid fraction. The number must be 0.7.

*rsdc@cfa.harvard.edu *

1998-06-10