It depends. If your redrawn figure is substantially similar as that of the original figure, you should obtain permission. For example, a simple color change or change of labels on an X and Y axis is never sufficient. Alternately, if your redrawn figure can be considered significantly different than the original figure, you can merely acknowledge the original source (e.g., “Based on”/ “After”/ “Redrawn from”/ “Adapted from”/ “Data from”) without formal permission. This is often a judgment call. Best practice is to obtain permission where there is any similarity between the original and redrawn figures.

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