It supported advanced algorithms such as multi-scale CLEAN and OTF (On-The-Fly) mosaicking, which were revolutionary for wide-bandwidth radio imaging at the time. Core Tools for Users
Released around late 2014, version 4.2.1 was a critical release during the early full-science operations of ALMA. casa 4.2.1.rar
Transforming raw visibility data into science-ready 2D or 3D images (data cubes). It supported advanced algorithms such as multi-scale CLEAN
Historical reduction guides are still available on the CASA Guides Wiki for users needing to process legacy data. Introduction to CASA - NRAO casa 4.2.1.rar