316 Shale * 400 0.451 410 0.472 420 0.493 430 0.519 440 0.535 450 0.554 460 0.571 470 0.590 480 0.607 490 0.621 500 0.637 510 0.650 520 0.663 530 0.677 540 0.688 550 0.699 560 0.707 570 0.714 580 0.721 590 0.729 600 0.732 610 0.738 620 0.740 630 0.740 640 0.739 650 0.738