请教个问题,Optics Letter 投稿模板中图片是用什么格式的,要设置多大?是放在参考文献后面,所有图放一起,题注放一起?Before the figures are dropped into the template, the main text and references in the template should be set to one column (Page Layout, Columns, One) and should be accurately sized (a maximum of 3.5 inches wide for one column, 7 inches for two), 这个要求是什么意思啊?