In the example models, quantites are sometimes written with a decimal point as in “-65.mV”, rather than just “-65mV”. Is this significant?
No, it doesn’t make any difference. This is just a programming convention to be clear about whether a quantity is an integer or a floating point number. The purpose is to avoid accidental integer arithmetic, like writing (10 / 3) which evaluates to 3 in most programming languages, whereas (10. / 3) implies a floating point division and evaluates to 3.333… But in PSICS it doesn’t make any differnce since the data types are internally defined already.