Adjusted the calculations of the axis limits
This should fix the x-axis of the coherence histograms being too long and the y-axis being too short.
Now for the x-axis it should round up to the nearest multiple of a power of 10 eg. 0.012 "rounds up" to 0.02 etc.
For the y-axis it will round up to the nearest power of 10 since this is a log axis eg. 110 "rounds up" to 1000 etc.