Status Stakeholders Drew Medlin John Tobin Emmanuel Momjian Mark Lacy  Outcome "compression fix" should never be applied on 3-bit data regardless of Pdiff behavior If compression evident (< ~ 20%) include qa note about possible error in flux scaling If scatter < 20% in (amplitude) calibration tables, leave be. If scatter > 20%, compare to Pdiff/compression levels → if tracking compression, leave be. If not tracking compression, flagging likely needed. If scatter is outside of 0.5–1.5 range (i.e. > 50%), flag affected data. Due date When does this decision need to be made by? Owner Amy Kimball

Background

What details are important in making this decision?

Action items

• Vivek Dhawan to run an SB in 8-bit to observe the phase calibrator J1051-3138 (from WS req 1202; 23A-255.sb44149262.eb44380172.60150.97359678241) to help determine "truth" for this source
• Lilia Tremou to investigate and results of the above SB
• John Tobin add note to pipeline Processing Plone page (http://go.nrao.edu/vla-pipe)
• Emmanuel Momjian → put note on Post Processing Notes/Issues page? (https://science.nrao.edu/facilities/vla/data-processing/post-processing-notes-issues)
• Mark Lacy to write templates for qa notes in the case of a bit (< 10%) or a bunch (> 10%) of compression