P1_R05 is the current version. R04 products will be available until all R05 products have been released.
MEaSUREs
The Making Earth Science Data Records for Use in Research Environments (MEaSUREs) Program is understanding the Earth system using consistent records. NASA has begun to deploy new types of sensors to provide three-dimensional profiles of Earth’s atmosphere and surface. Emphasis is placed into linking together multiple satellites into a constellation, developing the means of utilizing a multitude of data sources to form coherent time series, and facilitating the use of extensive data in the development of comprehensive Earth system models. For more details, please visit the MEaSUREs website.