a Raman spectra obtained at T = 2 K with increasing magnetic fields. b Raman spectra at B = 9.5 T recorded with increasing temperatures. Phonon modes are subtracted in (a) and (b) for better visualization of the magnetic excitations. c Contour plot of the magnetic Raman scattering intensity as a function of temperature and field. d Field-dependence of excitations around the intermediate phase (spheres) together with spin-wave excitations at low and high magnetic fields. e Thermal evolution of the MB mode energy at B = 6.7 and 9.5 T. Gray lines are guides to the eyes. f Thermal melting of the low-temperature magnetic modes at 0, 6.7, and 9.5 T. Standard deviations in (e, f) are indicated by error bars.