https://www.usa.gov/copyrighted-government-workshttps://www.rawpixel.com/image/3322282Edit ImageSaveSaveEditCropCustom TextThese twin "Christmas Trees" were formed by an instrument which records the proton beam of Argonne's ZGS. Original public domain image from FlickrMorePublic DomainFree CCO U.S. Government image for Personal and Business useInfoView CC0 LicenseJPEGSmall JPEG 1200 x 550 px | 300 dpiLarge JPEG 3200 x 1467 px | 300 dpiFree DownloadThese twin "Christmas Trees" were formed by an instrument which records the proton beam of Argonne's ZGS. Original public domain image from FlickrMore