k3d/share/shaders/k3d_terran.sl:29:		   float purt_scale = .9; float map_exp = 0;
k3d/share/shaders/k3d_terran.sl:104:  /*  "purt_scale" scales overall purturbation */
k3d/share/shaders/k3d_terran.sl:105:  latitude += chaos * (nonlinear * (1 - latitude) + purt_scale);
k3d/share/shaders/k3d_terran2.sl:29: *    lat_scale, nonlinear, purt_scale, map_exp - control scaling of 
k3d/share/shaders/k3d_terran2.sl:88:	  float purt_scale = .9;
k3d/share/shaders/k3d_terran2.sl:159:  /*  "purt_scale" scales overall purturbation */
k3d/share/shaders/k3d_terran2.sl:160:  latitude += chaos*(nonlinear*(1-latitude) + purt_scale);
