Notes. ^(a)MDCs from Cao et al. (2021) covered by the field. ^(b)MDCs in Motte et al. (2007) covered by the field, extracted from 1.2 mm continuum data from IRAM 30-m telescope (with effective angular resolution of ~11″ and spatial resolution of ~0.09 pc). ^(c)The beams are shown as “major axes × minor axes; position angles”. ^(d)Dense core 774 and 742 have mass of 25.0 and 19.4 M_⊙, slightly lower than 30 M_⊙. However, both of them have remarkable NH₃ detections in our observations. We therefore took them into the following analysis and do not distinguish them from other MDCs. ^(e)The mass of N58 could be highly overestimated in Motte et al. (2007) due to the significant contribution of free-free emission in this core. N58 is therefore excluded from the sample in Wang et al. (2022). However, MDC 532 is included in this work as the SED-fitted mass of MDC 532 is 68.6 M_⊙, which is still larger than 30 M_⊙. ^(f)NW12 is an interesting isolated core in its parental clump. It is covered by VLA 14A-107 though its mass is lower than 30 M_⊙. The mass of MDC 839 extracted by Cao et al. (2021) is also lower than 30 M_⊙. ^(𝑔)S26, also known as AFGL 2591, is excluded from our sample due to its different distance from Cygnux X region, of namely 3.3 kpc (Rygl et al. 2012).