I want to vertically shifted 10 time decay curves (~exp(t/tau) to avoid their overlap (in y log type scale, so 10 lines)but Origin does not carried out this operation correctly (The lines are deteriorated) N.B. all values in the worksheet are positive. Thanks
Not sure what you mean by "lines are deteriorated" - could you post an image of the graph here? (You can do this by clicking on the "Insert Image" button in the Format group). Otherwise, please contact tech support with your Origin Project.
If the two plots come from two datasets that just differ in scale (such as one is 10 times the other), then the plots should look exactly the same - only the y scale would be different. So I am not sure what the problem is.
Do you have speed mode on in one graph and off in the other? That could potentailly create such an effect. If this is not it, then you need to contact tech support, send them your OPJ with your exact version number etc.