Thanks for pointing this out.
I actually tried to swipe, to see the other graphs. In many different parts of the screen. It would have worked if I had not zoomed the y axis. So, with a zoomed y axis swiping did not take me to another graph. Instead, it panned the y-zoomed graph to the end of the y axis, and only then moved to another graph. When I tried this yesterday, I did not swipe long enough.
Anyways, this is not the way it should work. I should not be forced to pan the y axis all the way before being allowed to see another graph because it takes time and I had chosen to zoom on purpose, maybe wanting to return the to same zoomed spot after having looked at the other graph. Also, when zooming to fK level, it takes a long time to pan.
Actually, I would not even allow inter-graph swiping from the area of the current graph. The graph area should be for panning, be panning possible (zoomed graph) or not (unzoomed graph). The inter-graph swiping should only be possible via areas outside the graphs, to keep panning and inter-graph swiping separate.
On Android it seems that inter-graph swiping is not needed because all graphs are shown all the time, even in landscape view. This is unfortunate because the landscape view is unreadable. I do not know how easy it is to accommodate different screen sizes and aspect ratios but on a regular phone the landscape view is useless.