barnsley: R2=0.869, n0=0.072, k=-0.059; sierpinski: R2=0.766, n0=-0.924, k=-0.103; neuro: R2=0.938, n0=0.682, k=-0.543; galaxy: R2=0.942, n0=8.009, k=-0.397; lidar: R2=0.876, n0=8.401, k=-0.353; dem: R2=0.919, n0=7.370, k=-0.402
