Table : Number of electrons obtained from the trace of the 1-RDMs. For H2, the noisy calculation retains all electrons due to parity encoding and qubit tapering. Our calculations of larger molecules deviate noticeably from the correct number of electrons due to noise, effects that can be corrected by error mitigation. Estimated error bounds are given as a standard deviation based on the number of samples used in the measurements. The electron number for H2 is not affected by the number of samples.