Reflectivity

M1 was washed in early December and after that cleaned two times with CO$_2$. The ALFOSC zero point measurements (until the end of February 2012) indicate values similar to those shortly after re-aluminisation of the M1 in July 2009. Unfortunately, the reflectometer from the Liverpool telescope we have been using is broken and we do not have recent reflectivity measurements of the mirrors. However, the results from the zeropoint measurements are sufficient positive and we decided to postpone re-aluminisation of the mirrors we were considering for this summer.