A coordinate measuring machine (CMM) is used to determine the distance between Surface $\text{SP}$ and Surface $\text{SQ}$ of an approximately cuboidal shaped part. Surface $\text{SP}$ is declared as the datum as per the engineering drawing used for manufacturing this part. The CMM is used to measure four points $\mathrm{P} 1, \mathrm{P} 2, \mathrm{P} 3, \mathrm{P} 4$ on Surface $\mathrm{SP}$, and four points $\mathrm{Q} 1, \mathrm{Q} 2, \mathrm{Q} 3, \mathrm{Q} 4$ on Surface $\text{SQ}$ as shown. A regression procedure is used to fit the necessary planes.
The distance between the two fitted planes is ____________ $\mathrm{mm}$.
(Answer in integer)
