iraf.net

After scanning through past posts on this topic I realize now you must be bored of people asking this question, but I still can't find an answer. How do I calculate errors on Lorentzian and Gaussian lines in SPLOT?

I've read through the help page where it states that you must define nerrsam, sigma0 and invgain, but at no point does the help page specify what these terms actually mean. Because of this I'm struggling to assign "sensible values" to the 3 variable terms and have no idea if my pixel sigma value is any good.

How would I go about finding what these values represent so that I can calculate accurate and sensible errors?

See https://iraf.net/forum/viewtopic.php?showtopic=131480 and post back if you still have questions.

Apologies for my slow response to this.

The link you posted was extremely helpful, but I'd like to ask a little more about invgain.

As it represents the Poisson component (and is multiplied by the pixel value), would it be a good idea to set invgain to 1? Then the error associated with it would be root-I (analogous to poisson where the error on N is root-N).