Meridional intensity distributions. (A–F) Myosin-based reflections M1 (A), M2 (B), M3 (C), M4 (D), M5 (E), and M6 (F) at 35°C (red and orange) and 10°C (blue and green) in the presence (red and blue) and in the absence (orange and green) of 5% Dextran in demembranated muscle fibers, from the data in Fig. 1. Vertical dashed and continuous gray lines indicate multiples of the fundamental L and H periodicities, respectively. (G) Meridional intensity distributions at 35°C from demembranated fibers in the presence of Dextran (red, same data as panels A–F) and from intact EDL muscle of the mouse (black, Caremani et al., 2019), normalized by the main peak of the T1 reflection. a.u., arbitrary units.