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GAS EMISSIONS IN PLANCK COLD DUST CLUMPS—A SURVEY OF THE<i>J</i>= 1-0 TRANSITIONS OF<sup>12</sup>CO,<sup>13</sup>CO, AND C<sup>18</sup>O
A survey toward 674 Planck cold clumps of the Early Cold Core Catalogue (ECC) in the J = 1–0 transitions of 12CO, 13CO, and C18O has been carried out using the Purple Mountain Observatory 13.7 m telescope. Six hundred seventy-three clumps were detected with 12CO and 13CO emission, and 68% …