I've tried duplicating the width of the image and leaving a 2x2 black area in the right, but this doesn't make the job.
SPRITE nuke_sprite "sprite/nuke.png" 2 2 NONE 15
I guess this doesn't work because the following rescomp behavior:
What's the easiest way to make the sprite blink?- rescomp detects empty frame at end of animation row to not store empty frame data.