  The strong coupling of a superconductor to a spinful quantum dot results in
Yu-Shiba-Rusinov (YSR) discrete subgap excitations. In isolation and at zero
temperature, the excitations are $\delta$ resonances. In transport experiments,
however, they show as broad differential conductance peaks. We obtain the
lineshape of the peaks and their temperature dependence in
superconductor-quantum-dot-metal (S-QD-N) nanowire-based devices. Unexpectedly,
we find that the peaks shift in energy with temperature, with the shift
magnitude and sign depending on ground state parity and bias voltage.
Additionally, we empirically find a power-law scaling of the peak area versus
temperature. These observations are not explained by current models.
