Z (where it is assumed that oxygen represents 45 per cent of Z by mass) versus the total galaxian mass. Values for GR 8 and I Zw 18 have been added. The broken line shows the original correlation of abundance and mass from Lequeux et al. The solid line shows the correlation derived by Talent from the displayed data. The position of GR 8 in this diagram lies very closely to that predicted by the relationship of Talent. This is a strong confirmation of the relationship between abundance and total galaxian mass for irregular galaxies.  [ TIFF ]