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Other Useful Commands

Interactive continuum determination can be done with the command NORMALIZE/SPECTRUM as mentioned above. There are commands to measure the position of spectral features. CENTER/MOMENT determines positions from moments whereas CENTER/GAUSS fits a Gaussian profile; for very sparsely sampled point spread functions, CENTER/UGAUSS is preferred. Optionally, all positions can be stored in a working table file. Measurements of line strengths and equivalent widths can be obtained with the command INTEGRATE/LINE. Unwanted spectral features (e.g., spikes due to particle events) can be interactively removed with MODIFY/GCURSOR. The commands GET/GCURSOR and CONVERT/TABLE provide means to generate artificial images from cursor positions.

The fitting package permits the determination of line parameters and additional modelling of the data.

Petra Nass