Last photo for now. So we've seen how the patterns look when you look at -f, e and g's. The lines are all a bit skewed as you can see, there is an angle involved here.
But we know that our c-value occurs in multiple columns as well. Here is a 1000x1000 image with the same structure above, except instead of -f, e and g values it's the first 1000 e's where there is an a[t] = c.
So with the exception of which columns is being used, the rest is the same. Here you can clearly see the squares, the lines are sharper and less angled.