Age-sensitive colour–colour diagrams. Upper left panel: Hα–FUV vs. FUV–NUV, lower left panel: NUV–u vs. FUV–NUV, lower right panel: NUV–u vs. Hα–FUV. Black filled dots are for regions detected in all bands, red filled triangles are lower limits in Hα-FUV, blue filled triangles upper limits in NUV–u, and green open squares regions undetected in Hα and in the u-band. The blue, green, and red filled dots and solid lines indicate the expected colours at different ages (in Myr) for the assumed star formation history for an E(B − V) = 0.0 (blue), 0.1 (green), and 0.2 (red), respectively.
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