Same as Fig. 6 but a comparison with the escaping nebular LyC scenario of a continuous star-forming galaxy with Z = 1/50 Z_⊙ (model Ac1). (a) age from the onset of star formation of 100 Myr and (b) 10 Myr. The dotted curves indicate colour sequences as a function of the escape fraction of stellar LyC with the minimum IGM attenuation. The symbols indicate the positions with the escape fraction of 1.0, 0.1 or 0.01. The shaded regions indicate the regions explained with a combination of IGM and dust attenuations. From thin to thick, the cumulative probability to have the amount of the IGM attenuation increases. The SMC extinction law is adopted for the dust attenuation as shown by the solid arrow. The nebular gas temperature is assumed to be 1 × 10⁴ K.