Left: high-to-intermediate-J CO ratio (α) for 30 Doradus. For the derivation of α, 25 pixels were masked since they have nondetections for the required transitions. The location of R136 is also indicated by the red circle. Right: comparison of α between 30 Doradus (gray solid histogram) and N159W (black hatched histogram). The α values of N159W were calculated by applying Eq. (1) to the data from Lee et al. (2016), and the median value of each histogram is shown as the dashed line. For both 30 Doradus and N159W, the α values are on42^″ scales.