Hi,
If you’re starting fresh definitely update conf.yml. I noted this here. I was hesitant to say everyone should replace that file completely in case someone has any options configured that would get overwritten, but that one field does need to be added.
There is a distinction between a calibration (as in the calibration experiment that was run collecting the raw data and user input), and a fit, which is fitting some function to that data. What calibrate.py is displaying are the calibration experiment names, which you can then use to run fits against using that same script. The GUI setup page displays available fits, ie what function should be applied to the raw data coming from the sensors on the eVOLVER. Also just to note, those default calibrations are dummy data and fits, you should do your own before running any real experiments.
If you view that json file through a formatting utility (such as this) you can see how the fits are nested inside of the calibration, and that a calibration can potentially have multiple fits associated with it.
Zack