Dust properties of the z-GAL sample of sources derived using GMBB-Sizes versus MBB shown in red squares with the derived error bars. Sources denoted in black are some of the problematic sources that we treated with an extra step (discussed in Sect. 5.2). For comparison, in the background, we show the output results of the mock catalog when computing the dust parameters using MBB versus GMBB-Sizes. The black dotted line is the identity line.