  A recent processing effort has been undertaken in order to extend the
range-of-coverage of the GONG merged dopplergrams. The GONG-Classic-era
observations have now been merged to provide, albeit at lower resolution, mrvzi
data as far back as May of 1995. The contents of this document provide an
overview of what these data look like, the processing steps used to generate
them from the original site observations, and the outcomes of a few initial
quality-assurance tests designed to validate the final merged images. Based on
these tests, the GONG project is releasing this data product to the user
community (http://nisp.nso.edu/data).

Instrumentation and Methods for Astrophysics;Solar and Stellar Astrophysics