Before revision:  The force-force correlations are measured, and compared to predictions from an exact solution of a 1-d toy model , as well as field theory based on functional renormalization.
After revision:  The force-force correlations . While at the microscopic level these are given by the sequence, the experiment measures effective, macroscopic correlations. The latter are sequence-independent, i.e. universal, and constitute the central object of the underlying field theory of disordered systems. Comparing field-theory predictions and the exact solution of a 1-d toy model , as well as field theory based on functional renormalization.