Mass versus diameter for the clumps detected toward the GMC G345.5+1.0 in 1.2 mm continuum emission with reliable diameters. Filled circles indicate clumps detected in infrared MSX and Spitzer bands. Open circles indicate clumps that do not have an infrared counterpart. Triangles indicate clumps associated with MSFR-IRAS sources, which have luminosities  >10³ L_⊙. Boxes indicate clumps associated with MSX sources that satisfy MYSO candidate criterion (Lumsden et al. 2002). Arrows mark detection limits for masses (~2.9 M_⊙) and diameters (~0.2 pc). The continuous line indicates the detectable mass as a function of diameter (sensitivity limit), considering an intensity limit of five rms (~0.1 Jy beam^-1). Dotted lines indicate mean densities at 10³, 10⁴, 10⁵ and 10⁶ cm^-3. The densities are computed assuming a mean molecular weight of μ = 2.29.