Figure 3: (a) The photograph of Japan Exposure module onboard the International Space Station. The coordinate of the FIB sensor is drawn on by the blue arrows ( coordinate blue, coordinate in red, and coordinate by green), (b) An FIB sensor was mounted on SEDA-AP together with BBD. Proton tracks are measured by a photomultiplier (PMT2) that looks the scintillation fibers from the bottom side ( - plane), while for the - plane the other photomultiplier (PMT1) is used looking from the proceeding section of the ISS.