1971 BSA Lightening gas tank Paint pattern

I just picked up a 1971 OIF that I would like to paint back to an original color. I would like to know how much orange is on the gas tank under the trim piece. My tank has been repainted with no sign of the original paint to go by. Can anyone take a top view picture for me with the trim piece removed. Much appreciated ...

no one has a bsa OIF with original paint ???