Cross section ratios for deep-inelastic scattering from ³He, ¹⁴N and ⁸⁴Kr with respect to ²H have been measured by the HERMES Collaboration at DESY using a 27.5 GeV positron beam. The data cover a range in the Bjorken scaling variable x from 0.010 to 0.65 while Q² varies from 0.5 to 15 GeV². From the dependence of the data on the virtual photon polarisation parameter \varepsilon , values for R_A/R_D have been derived, where R is the ratio \sigma _L / \sigma _T of longitudinal to transverse DIS cross sections. The helium-3 and nitrogen data were published in 1999. Recently, those data were found to be subject to an A-dependent tracking inefficiency of the HERMES spectrometer, which was not recognised in the previous analysis. The resulting correction of the cross section ratios is significant at low values of x and Q² and substantially changes the interpretation of those data.

PACS numbers: 13.60.Hb, 13.60.--r, 24.85.+p, 12.38.--t