trade arrow with shadowed circle

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why the trade arrow sometimes surrounded by a shadowed circle like above ?  

Thank you for explanation 

[Alain Verleyen]

dahumeovn:

why the trade arrow sometimes surrounded by a shadowed circle like above ?  

Thank you for explanation 

I depends of what chart type you used. With Bar chart you have a circle, with Candlestick you don't have one.

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angevoyageur:

I depends of what chart type you used. With Bar chart you have a circle, with Candlestick you don't have one.

Thank you. Now do I know