SDSS DR7 survey mask polygon file

This is a polygon file for the Mangle software that defines the survey mask geometry for the SDSS DR7. It was originally available at this, now defunt, link. The file was originally created and distributed by Molly Swanson.

本文件为适用于Mangle软件的多边形文件，用于定义斯隆数字巡天第七次数据发布（SDSS DR7）的巡天掩膜几何结构。该文件最初可通过现已失效的此链接获取，最初由莫莉·斯旺森（Molly Swanson）创建并分发。