I don't think this is a graphic design question. However, I just happen to work on projects containing candlestick charts regularly and often must redraw the chart data.

The horizontals on a candlestick are consistent and used indicate where in the trading range the close/open happen. There's no data relayed by the length of the horizontals on a candlestick.

Some candlesticks will use stubby horizontals while others longer. And some candlesticks will use a wider bar to indicate the active trading range.. a la...

Green indicating up (open at the bottom) and red indicating down (open at the top).

I don't think this is a graphic design question. It may be closed as off-topic.

However, I just happen to work on projects containing candlestick charts regularly and often must redraw the chart data.

The horizontals on a candlestick are consistent and used indicate where in the trading range the close/open happen. There's no data conveyed by the length of the horizontals on a candlestick.

Some candlesticks will use stubby horizontals while others longer. And some candlesticks will use a wider bar to indicate the active trading range.. a la...

Green indicating up (open at the bottom) and red indicating down (open at the top).