Hey man. That's a great idea to have some indicator that shows the minimum spread of a candle.
I have a few suggestion though. Why not you add or place a mark (dots) on the chart on where is the min spread occur.
It could mark both bid and ask or and average value of both, doesnt matter.
Of course the mark will change places once a lower spread detected within the candle of th timeframe we choose.
Cheers bro!

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SpreadMIN:
The indicator is a histogram of the lowest/minimum spread only, given in a candle whilst the indicator has been running. Example scripts for placing buy or sell at the lowest spread are included.
Author: pabloroacho