WSClean version 3.4 =================== Released 2023-10-11 Summary: Version 3.4 contains a few major new features and important bugfixes. An important change is that the default gridder has been changed to the :doc:`wgridder <../wgridding>`: in *most* cases this gridder is fast and more accurate (thanks to Martin Reinecke) compared to the wstacking gridder -- the previous default gridder. Furthermore, there are quite some changes that improve complex imaging runs (e.g. faceting, DD psfs, IQUV imaging, etc.), memory & computational efficiency was further improved and various bugs have been solved. To make use of EveryBeam, WSClean 3.4 requires EveryBeam `version 0.5.2 `_ or newer. Full change list ---------------- * The :doc:`wgridder <../wgridding>` is now the default gridder. * Add an absolute :doc:`auto mask <../masking>` threshold. * Facet feathering. * Support for the MeerKAT and ALMA beams. * Compression of auto-masks to reduce memory requirements. * Improve efficiency of data & meta-data reading. * Allow output of a psuedo-Stokes-I source list. * Support applying independent xx/yy solutions when imaging Stokes I. * Support for diagonal and full Stokes solution correction and IQUV imaging with beam. Bug fixes --------- * Solve flux-scale issues when using facet imaging with diagonal solutions and beam correction. * Solve a crash when the model column needs to be created for measurement sets with heterogeneous spws. * Fix a crash when ``n_spws > 1`` and pb correction is used. * Improve :doc:`rank filter <../weight_rank_filter>` when using Briggs weighting (issue reported by A. Kutkin and T. Oosterloo). * Fix :doc:`DD PSF imaging <../direction_dependent_psfs>` with facets and multiple channels. * Fix possible corruption of start time (as written to FITS file). * Fix crash in multi-frequency imaging with iquv polarizations and beam correction. * Allow full Stokes facet imaging with beam and diagonal solutions. * Fix a few compilation issues and warnings on specific platforms. * Documentation improvements.