formatting individual cell borders

Name	Age	Sex	Height	Weight
Joyce	11	F	51.3	50.5
Thomas		M	57.5	85
	11		108.8	135.5
Jane	12	F	59.8	84.5
Louise		F	56.3	77
James		M	57.3	83
John		M	59	99.5
Robert		M	64.8	128
	12		297.2	472
Alice	13	F	56.5	84
Barbara		F	65.3	98
Jeffrey		M	62.5	84
	13		184.3	266
Carol	14	F	62.8	102.5
Judy		F	64.3	90
Alfred		M	69	112.5
Henry		M	63.5	102.5
	14		259.6	407.5
Janet	15	F	62.5	112.5
Mary		F	66.5	112
Ronald		M	67	133
William		M	66.5	112
	15		262.5	469.5
Philip	16	M	72	150
	16		72	150