Hi Kirit, In your posting we just looked at one notes that for 150 going 1100->1102-> 1101 there is considerable further improvement in the second step. Is this a known/understood effect? Presumably the subtraction coefficients which are used for 1102 come from the beam map data itself so it it odd for deprojection to do better than subtraction? Best, Clem P.S. Stefan pointed to the post 20140710_keck2014_chflags - although it is true that the channel selection cuts on A/B offset are being done as fraction of beam width it is also true that the 96GHz channels look very well behaved in this metric - switching it to absolute at the same level as 150 would likely not change the 95 channel selection. -- ********************************************************************** Clem Pryke - Associate Professor - Physics University of Minnesota Room 318 Physics and Nanotechnology Building 115 Union Street SE, Minneapolis MN 55455 Tel: 612-624-7578 Fax: 612-624-4578 email: pryke(a)physics.umn.edu **********************************************************************