  Cross section ratios for deep-inelastic scattering from $^3$He, $^{14}$N and
$^{84}$Kr with respect to $^2$H 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 $x$ between 0.010 and 0.65, the negative squared four-momentum
transfer $Q^2$ varies from 0.5 to 15 GeV$^2$, while at small values of $x$ and
$Q^2$, the virtual photon polarisation parameter $\epsilon$ extends to lower
values than previous measurements. From the dependence of the data on
$\epsilon$, values for $R_A/R_D$ with $R$ the ratio $\sigma_L / \sigma_T$ of
longitudinal to transverse DIS cross sections have been derived and found to be
consistent with unity. %The data are compared to measurements performed by NMC,
E665, and SLAC %on $^4$He and $^{12}$C, and are found to be different for %$x
<$ 0.06 and $Q^2 <$ 1.5 GeV$^2$.
