Total Capacity : The capacity of the user defined in the Capacity Template for that particular sprint duration
Allocated Work : The sum of the Original Estimates of all the issues assigned to the user in that sprint
Time Spent : The sum of all the time spent entered in all the issues assigned to the user in that sprint
Remaining Capacity : Total Capacity - Time Spent
Remaining Work : The sum of the remaining Estimates of all the issues assigned to the user in that sprint