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This gives rise to standing waves with a mixed nature (mixed modes). The restoring force for these waves is the pressure gradient in the envelope and gravity in the core.   The rotational splitting of mixed modes has been used to determine the degree of differential rotation in red giants interiors, revealing that the core of these stars is rotating about 10 times faster than their envelope \cite{Beck_2011}.  The amplitude and observability of stochastically excited pulsations in RGB stars depends on the interplay between driving and damping of the modes \citet{Dupret_2009}. A family of red giants with very weak dipole modes has been identified by \citet{Mosser_2011}. These stars have normal radial ($\ell=1$) pulsation modes, but exhibit depressed dipolar $\ell=1$ modes.   of the oscillation is responsible for the visibility of  diff --git a/figures/visibility_mosser_suppressed_2colors/visibility_mosser_suppressed_2colors.png b/figures/visibility_mosser_suppressed_2colors/visibility_mosser_suppressed_2colors.png  deleted file mode 100644  index 3ff00be..0000000  Binary files a/figures/visibility_mosser_suppressed_2colors/visibility_mosser_suppressed_2colors.png and /dev/null differ diff --git a/figures/visibility_mosser_suppressed_2colors/visibility_mosser_suppressed_2colors.pdf b/figures/visibility_mosser_suppressed_2colors/visibility_mosser_suppressed_band.pdf  similarity index 69%  rename from figures/visibility_mosser_suppressed_2colors/visibility_mosser_suppressed_2colors.pdf  rename to figures/visibility_mosser_suppressed_2colors/visibility_mosser_suppressed_band.pdf  index 430e20b..5c25731 100644  Binary files a/figures/visibility_mosser_suppressed_2colors/visibility_mosser_suppressed_2colors.pdf and b/figures/visibility_mosser_suppressed_2colors/visibility_mosser_suppressed_band.pdf differ