The Central Molecular Zone
(1,1) ground. J. O rtho I = 3/2. (2,2) densitometer. P ara I = 1/2. (1,1) ground level. (3,3) metastable. Metastable. (3,3) thermometer. 8 hrs. (3,3). 16 hrs. μ. (2,2). Unstable. 361 K. (2,2) unstable. 27.2 days. Critical Density 200 cm -3. Ground. (2,2) densitometer.
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