What parameters do Param1-Param8 mean in the UI flight plan "Other" waypoint maneuver input?

For the “Other” option in the UI flight plan waypoint drop down menu, there are unlabeled parameters that can be used to specify a custom maneuver. I figured out that Param5, Param6, and Param7 are latitude, longitude, and altitude, respectively, but what do the rest of the parameters mean? Is there documentation somewhere that defines what each parameter in the saved wp missionname.txt files is?

If an command is not defined in the GUI, just look it up in https://pixhawk.ethz.ch/mavlink/
As an example, look up MAV_CMD_DO_GUIDED_LIMITS
Then you can enter it’s ID and params