Left: combined (feathered) ALMA 1.3 mm continuum map of I18308. Eighteen cores c1-c18 are marked with their FWHM ellipses. Five extended fragments (f1-f5) are marked with the green diamonds. The dashed gray contour outlines the 2σ_{1.3 mm} boundary of three hierarchical regions: F1, F2, and the hub. The blue and green crosses mark the locations of the compact peak (Peak 1) and secondary peak (Peak 2) in the (UC) H II region detected by the VLA 1.3 cm (Lu et al. 2018). Right: ALMA 1.3 mm continuum map of I18308. The black contours are at [5, 10, 20, 40, 80, 160] × σ_{1.3 mm} (σ_{1.3 mm} = 0.1 mJy beam^-1). The dashed black contour outlines the 2σ_{1.3 mm} boundary of three hierarchical regions: F1, F2, and the hub. Green stars and blue crosses indicate protostellar and prestellar cores, respectively. Green diamonds indicate additional extended fragments. The synthesized beam and a 0.1 pc scale bar are shown in the lower left and lower right corners, respectively.