I used thenano scan to measure a beam profile on IOT2L.  near the periscope, the vertical waist diameter is 4411um.  The horizontal beam isnot gaussian, the waist diameter fit is 4007um.  (screen shot is first image attached to this report) This was taken 3 and 1/2" from the bottom periscope mirror, the periscope height is 23 and 1/2 ", and the top periscope mirror is approx 2'8 and1/2" from the viewport.  This data is saved as IOT2L1 on the nanoscan computer.  

I moved the scan head back to  14"  behind the botttom periscope mirror, and measured 4405 um diameter vertical , the horizontal beam still is non gaussian, but the diameter is 4070 um.  (screen shot is second image attached)

This data is now transfered to http://www.ligo-wa.caltech.edu/~sheila.dwyer/NanoScanData/IO/