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\label{def:two-readout-principle}
The \textbf{two-readout principle} states
that the coherence kernel $\tau_0$
provides two parallel readouts
on the point set~$\tau^3$:
\begin{enumerate}
    \item[\textbf{(F)}] \textbf{Fine-grain readout (topology).}
          Ultrametric cylinder domains
          $\{C_k(x)\}$ (II.D10),
          clopen basis (II.T04),
          totally disconnected Stone space (II.D14).
          The fine-grain probe is
          \emph{CRT tower depth refinement}:
          increasing stage~$k$ resolves finer
          cylinder partitions.

    \item[\textbf{(C)}] \textbf{Coarse-grain readout (geometry).}
          Betweenness, congruence, orthogonality---a
          relational structure that does \textbf{not}
          generate the cylinder topology.
          The coarse-grain probe is
          \emph{incidence and distance comparison}:
          relational data visible at any
          fixed finite stage.
\end{enumerate}
These readouts are \textbf{parallel},
not layered:
the fine-grain readout does not
produce the coarse-grain readout
by any continuous-path construction.
Both are earned from holomorphy
(the inverted dependency of II.T06),
which itself is earned from
the coherence kernel.