C_TT anisotropy shapes for the three isocurvature modes. Top: the shapes of the CDM isocurvature mode, neutrino density isocurvature mode, and neutrino velocity isocurvature mode are shown together with the adiabatic mode. The modes have the same amplitude parameters ( for the adiabatic mode and for each isocurvature mode). Bottom: the narrower multipole range illustrates the relative phases of the acoustic oscillations for these modes.