----------------------------------------------------------- VIPERS PDR-1 data products: Spectroscopic mask region files ----------------------------------------------------------- The VIPERS spectroscopic mask provides the geometry of each pointing in the W1 and W4 fields. These masks, together with the photometric mask, should be used to determine the angular selection function of the survey. The area within the spectroscopic masks are W1 5.478 deg^2 W4 5.120 deg^2 The masks are provided as a set of DS9 Region files (version 4.1). Each pointing in the survey consists of 4 quadrants (Q1,Q2,Q3,Q4). Each quadrant is stored in a polygon data structure. The following files are included vipers_pdr1_spectromask_W1.reg - Region file with all quadrants in W1 vipers_pdr1_spectromask_W4.reg - Region file with all quadrants in W4 regions/mask_W?P???Q?.reg - Subdirectory contains region files for individual quadrants. References: DS9 Region file format http://hea-www.harvard.edu/RD/ds9/ref/region.html __________ 30/09/2013