Estimation of emission measure for a single line

Dear ISIS users,

     I have recently installed the ISIS package and started using it for 
analysis of HETG grating data for my sources.  I want to generate the 
emission measure vs. temperature curve for various lines from different 
elements that are present in the spectra. I first loaded the spectrum 
and fitted a single gaussian to one perticular line and obtained the 
observed flux for that, ignoring the other part of the spectrum. I 
followed the istructions given in section 4.6 of the user manual to get 
the emission measure vs temperature curve for that line using the 
observed flux. But it gave me error saying there is no data for x-axis 
and nothing was plotted. I guess there is some problem with the value of 
"k" in the command "em = line_em(k, t);" that I am  suppling. Similarly 
for generating the ratio vs. temperature plot also it gave me same 
error.  There also it demands the value of two line indices n1 and n2.

       Since I am a new user, it will be of great help for me if I can 
get a little detailed reply regarding this.
        Thank you very much.
Regards.
Vikram
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