area under a curve / peak integration?

[nicocopez]

It can be very useful to calculate the integrated area under a band or a spectrum range. For example, I might be collecting a series of spectra, where I see how some of my bands change over time, while others should stay static. I would like to use the static bands to normalize the spectrum and calculate the area under the changing ones to get an idea of the evolution of my sample based on how the area under such bands evolve.

To do so, I would need the posibility to integrate the area under a specific part of the spectrum. This is relatively straight forward in ramanchada2. Could this be done in Oranchada?