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    First  command  enables  or  disables  the  buffering of spectra read in
    CLASS. ON means that for each spectrum, the header and its data are read
    once  from  file at first need, and then from a memory buffer for subse-
    quent needs. OFF means they will be read from file at each need. Default
    is ON.

    The buffering of spectra (headers and data) is done in memory. The dedi-
    cated amount can be customized with the Sic logical SPACE_CLASS.  It  is
    allocated  once,  at first need. Disabling this buffer (SET VIRTUAL OFF)
    also deallocates this memory.

    A bug in this buffer handling was present from May2006 to  Nov2008.  See
    the news for Dec08 release at for more
    details. Since occurence was small and is difficult to predict, the sec-
    ond  command  enables  or disables an error which is raised when the bug
    would have been encoutered. This is intended to help users to decide  if
    they  should  rerun  or not the processing of their data with the latest
    CLASS releases where the bug is fixed. Default is NOCHECK.

Gildas manager 2018-02-20