Handicap Calculation for Garth Maynard for Week 19

Week of Rounds Used:		15	14	13	12	11		Total		Average		90%		Rounded to:
Gross Score:		51	49	50	51	52		253		50.60
Hdcp Score (over Par):		15	13	14	14	15		71		14.20		12.78		13

What does this mean? How are handicaps calculated?
Handicap Projection for Garth Maynard for Week 20

If your next round score is:		Your new Handicap will be:
38-42		11
43-48		12
49-53		13
54-59		14
60-65		15