Voltage	z.percentile
24.46	-1.96
25.61	-1.44
26.25	-1.15
26.42	-.93
26.66	-.76
27.15	-.6
27.31	-.45
27.54	-.32
27.74	-.19
27.94	-.06
27.98	.06
28.04	.19
28.28	.32
28.49   .45
28.5	.6
28.87	.76
29.11	.93
29.13	1.15
29.5	1.44
30.88	1.96