Multiple thresholds
Many indices are based on a threshold. For many of these indices it is relevant to have several thresholds E.g. for Summer Days the threshold is tasmax > 25 degC. It is often requested to have alternative thresholds e.g. 21, 23, 25, 27, 29 degC. The index name should then be txgtn (TBC).
Cf. #73 (closed)