Feature: Global smile estimation
Problem: For data from very long slit spectrographs, e.g., slit length >> 60", 'global' smile might be too strong for spectroflat to correct.
Suggestion: Add a global smile correction as a first step.
Problem: For data from very long slit spectrographs, e.g., slit length >> 60", 'global' smile might be too strong for spectroflat to correct.
Suggestion: Add a global smile correction as a first step.