Left panel: available H and He lines from the combined FORS2 spectrum of EC 20338−1925 (thin lines), overplotted with the best atmosphere fit not including metals (thick lines). The atmospheric parameters derived are indicated in the plot. There are signs of interstellar absorption as revealed by the Ca II K feature in the blue wing of Hε. Right panel: the same as the left panel, except that here metals are included in the proportions listed in the text.