Keywords: class

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## R and T Memories

CLASS keeps 2 observations in memory, in two different buffers, called `R` and `T`. The `R` memory is the only one that may be accessed directly; the `T` memory is only used for operations on spectra (additions,...). The `GET n` command places the spectrum corresponding to entry number `n` in the `R` buffer, while the previous `R` content is stored in the `T` buffer. The command `SWAP` exchanges both memories.