Changes in Data Product v2

Please first see What's wrong in v1?

The v2 image product is reduced with the "multi flat" method mentioned in What's wrong in v1?. The systematic effect no longer exists.

The v2 catalog products are still based on v1, to keep the 1-to-1 correspondence between objects in v1 and v2 catalogs. Only entries related to Ks photometry are changed. We compared the photometry of objects in v1 and v2 images, and calculate the median differences between the v1 and v2 photometry in various magnitude bins (Table 1). Then we used the calculated differences to correct v1 Ks fluxes and magnitudes, and updated the v1 catalogs to form the v2 catalogs.

Table 1---Corrections as functions of magnitudes