Delta area %

.311" = 0.07596 square inches .311" .355" .358" .411" .430"
.355" = 0.09898 square inches + 30.31%
.358" = 0.10066 square inches + 32.52% + 1.70% +
.411" = 0.13267 square inches + 74.66% + 34.04% + 31.80%
.430" = 0.14522 square inches + 91.18% + 46.72% + 44.27% + 9.50%
.452" = 0.16046 square inches + 111.24 + 62.11% + 59,41% + 20.95% + 10.49%

you piqued my curiosity.