Handicap Calculation for Eric Johnson for Week 19

Week of Rounds Used:		15	14	13	12	11		Total		Average		90%		Rounded to:
Gross Score:		49	44	50	51	45		239		47.80
Hdcp Score (over Par):		13	9	14	15	10		61		12.20		10.98		11

What does this mean? How are handicaps calculated?
Handicap Projection for Eric Johnson for Week 20

If your next round score is:		Your new Handicap will be:
32-36		9
37-42		10
43-47		11
48-53		12
54-58		13