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1D projector sum, average and line

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**lohy**:

Hi,

I am using the 1D projector in quantumATK to visualise different things. In that regard I got confused reading the forum as well as the tutorial as to how I should understand the different projections.

In this tutorial (https://docs.quantumatk.com/tutorials/atk_transport_calculations/atk_transport_calculations.html) it is written as "With this tool you can project a potential or density along a certain direction, integrated or averaged over the two directions perpendicular to it. "

But in this post (https://forum.quantumatk.com/index.php?topic=9735.msg32591#msg32591) from 2022, it is not an integral " It's not an integral over the perpendicular direction, just a sum or average."

So my question is, how do you calculate/how should I understand, the sum, average and line in the 1D plot?

Thanks in advance,

Louise

**Anders Blom**:

The difference between a sum and an integral is just the normalization (and unit, to be exact). So the projection tool only gives sum, average and line projections, not an integral. I believe the word "integrated" is confusing (and wrong) in the tutorial.

**lohy**:

Thank you for clarifying :)

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