25 microns RMS from 1997 measurements without any hardware installed on the dish.
16 microns RMS in Sept 2002 - DSOS not activated.  I credit good RMS to DSOS standoff assemblies installed on the back of the dish with liquid heat exchangers circulating fluid and insulated from the ambient environment.
13.4 microns RMS in August 2003 - more calibrated and activated toothpick assemblies.
10.4 microns RMS in April 2005
~ Melanie Leong