No visibility at spacings higher than SHORT_UV_MAX is generated. Theo-
retical consideration on the method used in this task implies that
SHORT_UV_MAX should be at most (SHORT_SD_DIAM-SHORT_IP_DIAM). Smaller
values may need to be applied if, for example, the pointing accuracy of
the Single Dish is insufficient.
Default value is 0, meaning to use SHORT_SD_DIAM-SHORT_IP_DIAM