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Since the aluminisation the mirror has been CO
cleaned a few
times, which until now has kept the reflectivity at the same level as
that measured just after the aluminisation, indicating that there is
no need yet for a washing of the mirror. Especially, there was no
change in the reflectivity of the mirror after a CO cleaning
following the forest fires close to the observatory which created a
lot of smoke and ashes which might have affected the mirror.