OPMINANT sets minimum number of antennas for which the source must be up for the scan to be accepted. To be up, a source must be above the telescope slew limits, any specified horizon, and above OPMINEL.
This is used mainly for optimizing modes to help select scans, and for experiment planning in order to, for example, plot the uv coverage available if all low elevation data and all data with less than several antennas will be discarded. The default will have no effect on schedules. A separate value can be specified for each scan.