J. Kissel While using the channels that project the ISI ST2 GS13s in the Cartesian basis to the Test Mass QUAD suspension point in the Euler basis for the X-arm QUADs, i.e. H1:SUS-?TMX_M0_ISIWIT_?_DQ, I noticed that the projection matrices that create these channels were a copy-and-paste from the Y-arm, and therefore wrong by 90 [deg]. I've corrected the matrices at around 2014-03-27 21:55 UTC, saved, and committed a new safe.snap such that they stick. Details for the record: ----------------------- These matrices are calculated using the script /ligo/svncommon/SusSVN/sus/trunk/Common/MatlabTools/make_ISI2SUS_projections.m which takes in the locations of each SUS from the parameter file /ligo/svncommon/SusSVN/sus/trunk/Common/MatlabTools/SEI2SUScoordinates.m based on the systems SolidWorks drawings for that suspension. They are pre-calculated and stored in the mat file /opt/rtcds/userapps/release/isc/common/projections/ISI2SUS_projection_file.mat which I loaded into a matlab and ran the function /ligo/svncommon/SusSVN/sus/trunk/Common/MatlabTools/fill_matrix_values.m to automatically fill in the epics values. The theory behind these projections can be found in T1100617 #yakshaving