A candle with a non-finite open / high / low / close is a gap
Optionaltx of each candle (finite, sorted ascending): epoch ms or Date for a time axis, or plain
numbers (axes.x.type: 'numeric'). Omit to place candles by index.
OptionalvolumeOptional volume: bars in a bottom pane with their own scale
OHLC data of a candlestick chart: one entry per candle in every array.