For the Type-II (red dots) and Type-I GRBs (purple squares) present in our sample, FWHM_min versus the initial Lorentz factor Γ₀. In the left panel, the Γ₀ values are from different datasets and colour-coded as follows: L12 Lü et al. (2012), X19 Xue et al. (2019), X16 Xin et al. (2016), and Gu21 Gupta et al. (2021). The dashed lines represent the typical distance $R=2c{\mathrm{\Gamma }}_0^2{\mathrm{FWHM}}_{\min }$ where the dissipation process responsible for the prompt emission could occur. The right panel is the same as the left, but Γ₀ has been calculated using the dataset from Ghirlanda et al. (2018). Red points indicate GRBs from their golden and silver samples, while blue points represent lower limits on Γ₀.