So here is the right hand side 25k x 8k pixels file size is 185 meg right at the Flickr Limit. The "optimal size" calculated by PtGui was 79k x 28 ish, PtGui can only hande 65k wide so I now have this at 65kx20k or so - right at 1.3 gpixels - 101 frames
Heavy Runner and Reynolds Creek by mbarrett5076, on Flickr