Subject: Imaging with RHESSI Grids 1 and 2 Imaging with grids 1 and 2 is now supported by the latest version of the subcollimator response table (SRT_20020716.dat). Their FWHM resolutions are 2.26 and 3.92 arcseconds respectively. Parameters for grids 3-9 are the same as before. Events that may benefit from the higher resolution include 25 March at 20:07 and 20 April at 23:26. As mentioned earlier, there are some caveats that should be kept in mind when using the higher resolution grids: * Since coarser grids can be processed faster than finer grids, processing times may be longer if grids 1 and/or 2 are included. * Since a given grid only modulates source structure that is finer than about the grid resolution, some sources may not have fine enough spatial structure to benefit from the use of grids 1 or 2. Their inclusion in such cases will not improve and may in fact slightly degrade the mapping. One option is to make preliminary maps first using grids 3 and higher to see if there are any apparently unresolved sources. * Since February, the grid 2 energy threshold has been set to ~20 keV. * Since artifacts may result if the pixel size is chosen to be larger than about 1/2 of the subcollimator FWHM, the pixel size should be chosen to be no larger than 1 or 2 arcseconds respectively for grids 1 or 2. Please let me know if you encounter any problems. Good luck! gordon