e-Xtras

APS offers cost-effective online article enhancements, called e-Xtras, designed to supplement articles. The presence of e-Xtras is noted by a logo and footnote on the first page of the printed article, with the materials themselves available only online.

Supplementary materials can consist of tables, figures, videos, lists, or external links. When you upload your files via Manuscript Central, e-Xtras should be uploaded with the e-Xtra file designation. Acceptable file formats are .jpg, .tif, .eps for image files, Word, Excel, and PowerPoint files are acceptable if no other format is available. Videos should be submitted as .avi, .mpg or .mov formats. PDFs are not allowed. These e-Xtras may be referenced within the manuscript, but because they are intended to be supplemental in nature and not necessary to the understanding of the published article, each e-Xtra may only be called out once.

这是e-Xtra的注释  ，我不太理解是需要把附件打包后命名为e-Xtra还是怎么弄，求助

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