(a) Positions of STA, STB, and Earth at 00:00 UT on 2012 March 7. The black arrow represents the direction of the CME propagation. (b) 1-hour averaged proton intensities measured by SOHO/ERNE. (c) 1-hour averaged proton intensities measured by STA/HET. (d) 1-hour averaged proton intensities measured by STB/HET. The black plus signs represent the peak flux of each energy range. The inset panels display the power-law fitting of peak flux, and the fit spectral indices are indicated. The shaded region is the time interval used for the fluence spectrum.