Unreadable labels of correlation heatmap

[lars-reimann]

Describe the bug

The x-labels of a correlation heatmap overlap, which greatly reduces readability. The y-labels are partially cut off.

To Reproduce

Check the tutorial for data visualization:

Expected behavior

Labels should be readable, e.g. by rotating them 90 degrees and ensuring that the created image is large enough.

Screenshots (optional)

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Additional Context (optional)

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