Answer to comments of Referee #3

Abstract

We thank the reviewer for the detailed remarks and the effort to improve our paper. We responded to all comments as best as we can. Section 5.2 of the manuscript with marked changes is attached to the answers. In general, this is a good paper and I recommend only a few minor corrections. Section 3.4 is about the aging correction for the WLS. As I understand your text, the WLS is only used to make a flat-field correction to the detector array.