Keywords: class-evol1

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## Command names

Due to its long history, CLASS77 command name were sometimes awkward, e.g. the `GAUSS` command which was launching a fit even though the fitting function was not Gaussian! We made the minimum number of changed to avoid disturbing too much long standing habits of CLASS users. We are also furnishing a CLASS procedure named `old-command-names.class` which aliases new and old names through the use of GILDAS symbols. This is distributed for maximum backward compatibility, e.g. to enable use of CLASS77 within CLASS90 (this is not foolproof though). However, it is clear that old command names are obsolete and we advise users against the use of the aliases. In particular, users' new procedures should use new command names. Table displays an exhaustive list of correspondence between old and new names. The fit-related commands have been gathered into a separate language named `FIT`. The `GAUSS` and `FIT` commands have been replaced by the more explicit `MINIMIZE` and `VISUALIZE` names. For logical reasons, `SUM` has been replaced by the `AVERAGE`. Due to the new way of dealing with OTF data, the `RECORD` command is now obsolete and will disappear soon. The `GRID` command is also obsolete as its functionalities have been redistributed and extended in the `TABLE` and `XY_MAP` commands (cf. section ). Finally, the `CFITS` language has been replaced by a single `LAS\FITS` command. Indeed, most of the `CFITS` commands were customized for tapes which are an obsolescent storage medium.

Table: Correspondence between command names in CLASS77 and CLASS90.
Old names | New names
`ANALYSE\GRID` | Obsolete (replaced by `ANALYSE\TABLE` and `MAP\XY_MAP`)
`ANALYSE\DISPLAY` | `FIT\DISPLAY`
`ANALYSE\FIT` | `FIT\VISUALIZE`
`ANALYSE\GAUSS` | `FIT\MINIMIZE`
`ANALYSE\ITERATE` | `FIT\ITERATE`
`ANALYSE\KEEP` | `FIT\KEEP`
`ANALYSE\LINES` | `FIT\LINES`
`ANALYSE\METHOD` | `FIT\METHOD`
`ANALYSE\RESIDUAL` | `FIT\RESIDUAL`
`LAS\SUM` | `LAS\AVERAGE`
`LAS\RECORD` | Obsolete (not useful anymore)

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