Y Axis title orientation?

So I would like to give vertical orientation to Y axis title. There is a command for rotation with 180 but I could not find any command for rotating by 90 or just simply give vertical orientation.

Thanks for help.

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I do not understand your question because the Y title is already drawn vertically.
There no way to draw it an other way, it is parallel to the axis. If you need some special presentation you can suppress the title and draw a TLatex where/how you need instead.

That was my mistake. I wanted to present them horizontally. Thanks for your advise regarding latex.