agreement with the reported magneto-transport experiments [@PhysRevB.93.085442].

We note that our interpretation of these peaks is at odds with another recent optical study [@chinotti2016electrodynamic] that has observed similar features in low energy conductivity but proposes that the peak around 200 cm$^{-1}$ derives from the van Hove singularity in a simplified WSM band structure. We do not favor this interpretation as realistic band structure calculations of YbMnBi$_2$ show it to exhibit certain non-idealities that will obscure the canonical behavior given in Ref. [@PhysRevB.93.085442]. Moreover, the Weyl state appears to be dependent on the existence of the magnetic structure for which there is no evidence. To reiterate, the the gross features of the optical response can be explained by the electronic structure of a uncanted state with a slightly shifted chemical potential.

Conclusion
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We have measured the reflectivity of YbMnBi$_2$ in the infrared regime and calculated the optical conductivity. The various features in the conductivity has been interpreted using DFT band structure calculations. We believe that the low energy peaks in conductivity at 200 cm$^{-1}$ and 950 cm$^{-1}$ are true inter-band transitions and the spectrum can be explained reasonably well without invoking a canted magnetic structure which is necessary to realize 