In a time-series plot comparing two categories (e.g. male vs female), what best practice improves interpretability?

Question

Answer

Use the same colour for both lines and rely on the legend for distinction.

Answer

Use multiple overlapping line geometries to show uncertainty.

Answer

Use subtle colours and different line types (e.g. solid vs dashed) for accessibility.

Answer

Use thick solid lines in bright contrasting colours (e.g. red and blue).

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