Change the Label field

HI all,

Is it possible to change the x-axis interval values from negative to positive,

  

Like in the above picture we have interval -20,-15,-10,-5,0,5,10,15,20 and so on....

But we want to make it like 20,15,10,5,0,5,10,15,20.......

Is it possible?

Thanks in advance.

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