ox-charts
Reading the numbers

The OHLC readout

Open, high, low, close and the change for the bar under the crosshair.

The first line in the chart's top-left corner reads O 24,512.35 H 24,530.10 L 24,498.00 C 24,521.60 +9.25 (+0.04%) for the bar under the crosshair, or the latest bar when the crosshair is off the chart.

TermMeaning
O H L CThe bar's first, highest, lowest and last traded prices.
ChangeClose minus the previous bar's close, not minus this bar's open. The first bar of the history compares with its own open.
%The same change as a percentage of the previous close.

Colour follows the change's sign. Numbers are grouped Indian-style (1,00,000), use a true minus sign, and print in the symbol's own decimals (two for NIFTY, four for USD/INR), the same as its price axis. The line starts with the symbol's readable name (NIFTY BANK, BANKNIFTY 26 SEP 52500 CE), which opens symbol search; hover it for the raw id.