[CLEAN\]DISCARD BufferName Discard (i.e. remove from the memory and the list of known variables) the specified buffer. Only the most important buffers (e.g. DIRTY, CLEAN, etc...) can be dis- carded. The current list is: CCT, CLEAN, CONTINUUM, DIRTY, MASK, PRIMARY, RESIDUAL, SINGLEDISH, SKY, UVCONT, UVSELF, UV_MODEL