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State estimation proposals in distribution power systems heavily rely on pseudo-measurements, primarily originating from standard load profiles. Actual load profiles are suspected to deviate significantly from the standard load profiles, and research work is ongoing to determine the amount of this deviation and to find ways to synthesize more realistic profiles. The analysis of the propagation of error and uncertainty of load profiles in state estimation must be investigated, as state estimation in distribution is being experimentally deployed, and the use of any available source of data is under consideration. The findings should provide hints on the accuracy to be expected and on corrections to be applied to update classical pseudo-measurements.