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Efficiency fluctuations of small machines with unknown losses

The efficiency statistics of a small thermodynamic machine has been recently investigated assuming that the total dissipation was a linear combination of two currents: the input and output currents. Here, we relax this standard assumption and reconsider the question of the efficiency fluctuations for a machine involving three different processes, first in full generality and second for two different examples. Since the third process may not be measurable and/or may decrease the machine efficiency, our motivation is to study the effect of unknown losses in small machines.