Two examples of simulated stellar atmosphere spectra (using JWST/NIRSpec) for T_eff = 4000 K, z = 1 on the left and T_eff = 50 000 K, z = 10 on the right. For the 4000 K spectra no spectral lines were detectable at any redshift at either 26 or 27 AB mag. Two metal lines can be observed at a peak magnitude of 26 mag for T_eff = 50 000 K, and both of them can also be distinguished at 27 mag. These figures illustrate that few spectral lines are detectable at these temperatures, most apparently for 4000 K.