Dave, Evan

Here is a larger scan of the the Y arm loss as a function of ETMY spot position. I tried to get out to a 6 cm radius from the nominal, but eventually the alignment was so bad that the arm broke lock. Also, I've masked out points for which the TRY dc value is less than 10 ct.

Also attached is Friday's measurement, with the colors rescaled to match the colors of today's measurement. Note that Friday's measurement is a smaller spiral. It's hard to know how to compare these measurements, but I've attached another plot where I suggest where Friday's small spiral may fit into today's big spiral.

Note that the zero points of the displacements are not consistent between different measurements; each time I have simply aligned the arm to get good buildup and then started the spiral. Attempting to reproduce the pointing from day to day would be a much more involved process.