Rephrase to explain this phrase from a scientific paper on machine learning with clarity and readability:
For all the plots, we use test data in the training range except we use an extended test dataset covering 49 equally spaced alpha on NAME_1. 1, and 21 D on NAME_1. 2. Provide your response in exactly 7 paragraphs (separated nearby paragraphs with 3 aterisk symbols ***).
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