In this video two symbols are added to a chart and Custom1Line indicator is used to show value ratio (Close of Symbol1 / Close of Symbol2).
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Data.C / Data.C
It divides Close of Data1 by Close of Data2 (Data# is counted from 1)
Also you can see/change and show/hide (by checking/unchecking it) data subcharts using Data button at the left bottom corner of any chart window.