  Ridge-like correlations in high-energy proton-proton collisions reported by
the CMS collaboration suggest a collective flow that resembles the one in
heavy-ion collisions. If the hydrodynamic description is valid then the effect
results from the initial anisotropy of the colliding matter which depends on
the structure of protons. Following recent theoretical developments, we propose
several phenomenological models of the proton structure and calculate the
anisotropy coefficients using the Monte Carlo Glauber model. Our estimates
suggest that the event multiplicity dependence allows one to discriminate
between different proton models.
