• Figs 1 and 2: taken at the flange of TMSX. You can see an image of the ETMX (pink colored).
• Fig 3 is the 2nd mirror of BRT; the bright green spot was observed when the cavity was locked to green. The spot was found lower than the horizontal center of the mirror.
• In Fig 4, you can find the green spot on the 1st mirror is also lowered.
• FIg 5: when the iris left on the BRT bread board closed, the green spot seemed lowered again.

So the TMSX is located higher now?