I would to develop an indicator that plot an horizontal line (simply a plot) on the chart with the actual month HIGH/LOW and the previous month HIGH/LOW.
I tried to add a secondary daily data series and retrieve the bar index of first of month and then use the MAX/MIN function with Highs[1] parameters starting this index but is not working.
Please, if not really hard, can you provide me a sample of code?
Thank you

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