Positions of 187 identified clouds superposed on the ¹³CO(J = 1–0) integrated intensity image (the same as the top-left panel of figure 1). The color bar on the right shows the integrated intensity scale in units of Jy beam⁻¹ km s⁻¹. The 1 σ noise level of this map is 0.015 Jy beam⁻¹ km s⁻¹, or 0.78 K km s⁻¹, and the peak value of the map is 1.58 Jy beam⁻¹ km s⁻¹ or 81.7 K km s⁻¹. The synthesized beam size, 1|${^{\prime\prime}_{.}}$|4 (circular) or 98 pc, is shown at the bottom-left corner. The sizes of the circles are proportional to the molecular gas masses. The molecular gas masses of the identified GMCs, |$M_{\rm ^{13}CO}$|⁠, derived from the ¹³CO data, range from 1.8 × 10⁴ M_⊙ to 4.2 × 10⁷ M_⊙. Two circles, corresponding to the molecular gas masses of 10⁶ M_⊙ and 10⁷ M_⊙, respectively, are displayed at the top-right corner for reference. Note that no clumps are identified in the CND region (r < 5΄ or 350 pc) in the applied criteria (8 σ threshold and 4 σ increment), although significant (>5 σ) emission is detected there.