ANALYSE\MODEL variable [X_variable] Generates a CLASS spectrum from a 1D SIC variable. Note that the 1D variable can be (and frequently is) a subset of a higher dimensionality variable. This command is typically used either to generate test data, or more frequently to transfer data from a GILDAS image (or cube) to CLASS. A second variable, if present, is interpreted as an associated axis scale for a presumably non linear frequency axis, as can occur for non resampled data from AOS backends (or optical spectra). Please note however that non linear axes are a largely untested feature in CLASS.