Related by context. Frequent words. (Click for all words.) 61 amplitudes 57 wavelengths 54 irradiance 54 amplitude 53 intensity 52 excitation 52 spectra 51 velocities 51 redshift 50 brightness 50 laser pulses 50 resonant frequency 50 magnitudes 50 refraction 49 frequency 49 GeV 48 anisotropy 48 minima 48 nuclei 48 gradients 48 transmittance 47 infrared wavelengths 47 wavelength 47 reflectivity 47 luminosity 47 conductance 47 pulsations 47 pulses 47 auroral 46 abundances 46 physiological responses 46 isotropic 46 fluorescence 46 reflectance 46 particle sizes 46 neuronal activity 46 fluxes 46 oscillations 45 picosecond 45 perturbations 45 magnetization 45 spatial resolution 45 maximal 45 morphologies 45 conformations 45 latitudes 45 refractive index 45 sunspot activity 45 X ray beam 45 frequencies 45 laser pulse 45 magnetic fields 44 GPa 44 vibrational 44 diffraction 44 oxygen uptake 44 altitudes 44 femtoseconds 44 coefficients 44 modulations 44 magnification 44 METs 44 electron beams 44 Gaussian 44 durations 44 Supplementary Fig 44 histograms 44 luminance 44 surface roughness 44 electron volts 44 isomers 44 photons 43 varying distances 43 bandgap 43 external stimuli 43 torques 43 gradations 43 albedo 43 interferometry 43 spectral 43 VO2max 43 ionosphere 43 attenuation 43 radii 43 photonic crystal 43 Fig. 43 intervals 43 oscillation 43 fermions 42 muon 42 densities 42 sine wave 42 variability 42 geomagnetic 42 msec 42 voltages 42 Hz 42 X ray emission 42 elevations 42 synchrony 42 anisotropic