Re: ISIS Equivalent Width Function

Hi Mike:

Thanks for the function and help. I have one more
question about the EW:

-I'm getting different values using Sherpa and ISIS.
In Sherpa my data are HEG+-1 using add_grating_orders.
In ISIS I'm using HEG+-1 and MEG+-1, and

match_dataset_grids([3,1,2]);
variable g = combine_datasets([1:4]);

where 1 and 2 are HEG+-1 and 3,4 are MEG+-1. 

-I'm using a model like:
fit_fun("powerlaw(1)+gaussian(1)+gaussian(2)+gaussian(3)");

Using your EW function, I'm doing :

eqw=eqw(g,3) for the gaussian(1).

-the continuum of the source that I'm working on is
very strong, and there aren't too much photons in the
lines (if this helps)

-The EW that Sherpa is calculating are ~2 times the
ones from ISIS. Any help with this?


Thanks a lot again!
Juan

########################################################
GERARDO JUAN MANUEL LUNA
Instituto de Astronomia, Geofisica e Ciencias Atmosfericas
Universidade de Sao Paulo
Brasil
05508-900
########################################################


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