Left panels: variations of the Hα–FUV (upper) and FUV–NUV (lower) age-sensitive colour indices as a function of time derived for the star formation history given in Eq. (1). Different colours are used for three different dust attenuations: E(B − V) = 0.0 (blue), 0.1 (green), and 0.2 (red). The black solid line shows the median of the observed colour distribution, the grey lines the 16% and the 84% quartiles of the distribution. Right panels: distribution of the two colour indices for the detected (black) and undetected (red – lower limit) H II regions.
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