Column density ratios.
|Orion KL (HC)||1.6 × 1015b||≥1.6|
|Orion KL (MM4)||1.4 × 1015b||≥2.0|
|Sgr B2a||2.2 × 1017c||≥11|
|B1-b||1.5 × 1012d||≥1.5|
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