79 citations · 104 across the 3 of their papers we have counts for
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M. Matsuura, A. K. Speck, B. M. McHunu +6
We present a deep and wide field-of-view (4'x 7') image of the planetary nebula (PN) NGC 7293 (the Helix Nebula) in the 2.12 micron H2 v=1-0 S(1) line. The excellent seeing (0.4'')…