ISIS: loading data with proper statistical error

Dear ISIS users,

I just started to use ISIS one week ago, and although I've been steadily becoming more comfortable with its use, I'm now stuck on a problem that should be very simple.

When I load a spectrum using 
id = data_load ("filename.pha");

it seems that the statistical errors are not calculated.

I noticed that when I was trying to plot the data, but also when I do:

data = get_data_counts(id);
print (data.err);


Am I missing something?

A solution could be to calculate myself this statistical uncertainty, e.g. doing:
data.err = sqrt(data.value);

but then, how to load this array back in the the dataset described by id??


Thanks in advance for your answers,
Nicolas

Dr. Nicolas Barrière
***********************************************
barriere_at_email.domain.hidden510 - 643 - 4747
Space Sciences Lab
7 Gauss way
Berkeley – CA 94720
USA
***********************************************

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