We present an updated analysis of the mass composition of cosmic rays in the energy range of
1016.8 to 1018.3 eV. It is based on measurements with the LOFAR telescope of the depth of shower
maximum, Xmax. We review the improvements to the simulation-based reconstruction setup, as
well as the selection method to obtain a minimally biased Xmax dataset. Results include estimates
of the mean and standard deviation of the Xmax distribution. A statistical analysis at distribution
level has been done as well, using a four-component model of light to heavy nuclei. It confifirms
our previous results showing a signifificant low-mass fraction in this energy range.
The radio technique has advanced enough that multiple observatories are publishing results on
Xmax. As the array layouts and methods vary, it is interesting to compare the approaches, in light
of the observed difffferences in the Xmax results. We therefore show additional information on bias
tests used in the Xmax reconstruction and sample selection process.