div class=trans-pagebuttonPage 1button div class=trans-image amp-img class=trans-thumb alt=Page 1: GBT 4 - National Radio Astronomy ObservatorylibrarynraoedupublicmemosgbtlegacyGBT_Memo_4pdf · GBT Memo No PERFORMANCE geometrical and a clear aperture doubly offset src=https:reader031fdocumentsnetreader031viewer20220217185b88f8a17f8b9abf5c8ca934html5thumbnails1jpg width=142 height=106 layout=responsive amp-img divdivdiv class=trans-pagebuttonPage 2button div class=trans-image amp-img class=trans-thumb alt=Page 2: GBT 4 - National Radio Astronomy ObservatorylibrarynraoedupublicmemosgbtlegacyGBT_Memo_4pdf · GBT Memo No PERFORMANCE geometrical and a clear aperture doubly offset src=https:reader031fdocumentsnetreader031viewer20220217185b88f8a17f8b9abf5c8ca934html5thumbnails2jpg width=142 height=106 layout=responsive amp-img divdivdiv class=trans-pagebuttonPage 3button div class=trans-image amp-img class=trans-thumb alt=Page 3: GBT 4 - National Radio Astronomy ObservatorylibrarynraoedupublicmemosgbtlegacyGBT_Memo_4pdf · GBT Memo No PERFORMANCE geometrical and a clear aperture doubly offset src=https:reader031fdocumentsnetreader031viewer20220217185b88f8a17f8b9abf5c8ca934html5thumbnails3jpg width=142 height=106 layout=responsive amp-img divdivdiv class=trans-pagebuttonPage 4button div class=trans-image amp-img class=trans-thumb alt=Page 4: GBT 4 - National Radio Astronomy ObservatorylibrarynraoedupublicmemosgbtlegacyGBT_Memo_4pdf · GBT Memo No PERFORMANCE geometrical and a clear aperture doubly offset src=https:reader031fdocumentsnetreader031viewer20220217185b88f8a17f8b9abf5c8ca934html5thumbnails4jpg width=142 height=106 layout=responsive amp-img divdivdiv class=trans-pagebuttonPage 5button div class=trans-image amp-img class=trans-thumb alt=Page 5: GBT 4 - National Radio Astronomy ObservatorylibrarynraoedupublicmemosgbtlegacyGBT_Memo_4pdf · GBT Memo No PERFORMANCE geometrical and a clear aperture doubly offset...