translate NaNs in the data to zeros; skip missing mandelbrot data
translate NaNs in the data to zeros; skip missing mandelbrot data

chr-engwer/Vc,VcDevel/Vc,VcDevel/Vc,chr-engwer/Vc,VcDevel/Vc,VcDevel/Vc,chr-engwer/Vc