I forgot to attach the command file for the hyperbolic grid. Here it is: create mappings rectangle specify corners -4. -15. 4. 5. lines 25 64 boundary conditions 1 1 1 1 mappingName squarebig exit spline enter spline points 90 0.0000000 0.0100000 0.0015643 0.0098769 0.0030902 0.0095106 0.0045399 0.0089101 0.0058779 0.0080902 0.0070711 0.0070711 0.0080902 0.0058779 0.0089101 0.0045399 0.0095106 0.0030902 0.0098769 0.0015643 0.0100000 0.0000000 0.0100000 -0.1000000 0.0100000 -0.2000000 0.0100000 -0.3000000 0.0100000 -0.4000000 0.0100000 -0.5000000 0.0100000 -0.6000000 0.0100000 -0.7000000 0.0100000 -0.8000000 0.0100000 -0.9000000 0.0100000 -1.0000000 0.0414590 -1.0032616 0.0722545 -1.0104690 0.1018936 -1.0215069 0.1299019 -1.0361986 0.1558310 -1.0543090 0.1792662 -1.0755483 0.1998321 -1.0995764 0.2171998 -1.1260088 0.2310912 -1.1544225 0.2412840 -1.1843627 0.2476151 -1.2153502 0.2499831 -1.2468891 0.2483501 -1.2784746 0.2427423 -1.3096011 0.2332494 -1.3397706 0.2200234 -1.3685000 0.2032759 -1.3953297 0.1832750 -1.4198302 0.1603408 -1.4416093 0.1348403 -1.4603185 0.1071817 -1.4756585 0.0778077 -1.4873835 0.0471884 -1.4953060 0.0158138 -1.4992993 -0.0158138 -1.4992993 -0.0471884 -1.4953060 -0.0778077 -1.4873835 -0.1071817 -1.4756585 -0.1348403 -1.4603185 -0.1603408 -1.4416093 -0.1832750 -1.4198302 -0.2032759 -1.3953297 -0.2200234 -1.3685000 -0.2332494 -1.3397706 -0.2427423 -1.3096011 -0.2483501 -1.2784746 -0.2499831 -1.2468891 -0.2476151 -1.2153502 -0.2412840 -1.1843627 -0.2310912 -1.1544225 -0.2171998 -1.1260088 -0.1998321 -1.0995764 -0.1792662 -1.0755483 -0.1558310 -1.0543090 -0.1299019 -1.0361986 -0.1018936 -1.0215069 -0.0722545 -1.0104690 -0.0414590 -1.0032616 -0.0100000 -1.0000000 -0.0100000 -0.9000000 -0.0100000 -0.8000000 -0.0100000 -0.7000000 -0.0100000 -0.6000000 -0.0100000 -0.5000000 -0.0100000 -0.4000000 -0.0100000 -0.3000000 -0.0100000 -0.2000000 -0.0100000 -0.1000000 -0.0100000 0.0000000 -0.0098769 0.0015643 -0.0095106 0.0030902 -0.0089101 0.0045399 -0.0080902 0.0058779 -0.0070711 0.0070711 -0.0058779 0.0080902 -0.0045399 0.0089101 -0.0030902 0.0095106 -0.0015643 0.0098769 0.0000000 0.0100000 shape preserving (toggle) lines 101 mappingName rod-cyl exit hyperbolic start from which curve/surface? rod-cyl distance to march .75 lines to march 11 geometric stretching, specified ratio 1.15 generate and here errors appear. Alessandro