Figure E-14-One-year 0 0 0 0 0 0 0 0 0 0 0 0 DESIGN AND MODELING OF PROPPED FRACTURES optimum NPV for various discount rates. 0 0 0 0 0 0 0 0 0 0 0 0 2 7 0 6, 03 b (0 v) d- c9 (u 7 7 7 E-29