  The purpose of this document is to demonstrate the reasoning behind the
specific measurement requirements in the white paper by James et al. titled
"The value of surface-based gravity and gravity gradient measurements at the
Moon's south pole with Artemis III". As described in this document, measurement
requirements in practice will depend on a number of factors, including the
geographic location, the shape of the local terrain, the precision to which
elevation is known, and the nature of drift in the gravimeter.
