Curve of growth for the Fe i transitions detected in the z_abs = 0.45206 system towards HE 0001−2340. For each point we indicate the rest wavelength of the Fe i transition involved. The smooth curve corresponds to b = 0.55 km s^-1 and log N(Fe i) = 12.289 (see text). The red and blue points correspond to transitions seen on the quasar continuum and emission lines, respectively. The Fe iλ2719 line falls near the top of the quasar Lyα emission and is characterised by a high value of the ELR to continuum flux ratio (x = 2.31). We note that the corresponding W measurement lies well below the curve-of-growth expectation because of partial covering of the ELR. The Fe iλ3441 is characterised by a low x value, and a barely significant shift is seen.