Modify graph axis

Your sample code does not run for me. I am missing some series such that the following line gives an error

Code:
 group {%mygroup}  {%index}   {%i}_2_0m -{%i}_2_0m ({%i}_2_0m -{%i}_2_0m)

In any case, in your code you also have

Code:
series {%index} = {%trend}-@first({%trend})-1

Did you mean to add the '-1'. If you remove it I believe it will fix the problem

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