-const double fkTempSlope = 0.017; // 1.7% per deg. C, seems about right for all APDs, from studies at Catania, and by Rachid
+const double fkTempSlope = 0.017; // 1.7% per deg. C, seems about right for all APDs, from studies at Catania, and by Rachid.
+// Note that this is only valid at gain M~30; i.e. voltages at V30.
+// At V50, it's more like 2.25%/C, and at V20 about 1.35%/C (also info from Catania)