Amplitude tracking csv attributes

Dear SNAP users,
I process glacier movement with Amplitude tracking, could you please specify what the results in .csv file means?
distance (deformation in LOS?)
velocity (velocity per day or year?)
heading (angle between north direction and each point of the image?)
range shift (deformation in range direction?)
azimuth shift (deformation in azimuth direction?)
I can deduce some of the results but also i don’t know what is the unit (meters?)
I would be grateful for you answer