请问一下有一个审稿意见是Symbols or keys representing data series in graphs and charts must not be shown on the figure itself but be included in the legend typed on a separate sheet，用软件翻译了一下也没明白是什么意思，哪位可以告知一下这句话是什么意思？图的格式是怎么要求改的呢？非常感谢！

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