The off-axis angle of the neutrino beam from J-PARC on the sea level. The baseline lengths (distance travelled by neutrinos from the source) are shown by vertical red contours, and the off-axis angles at the sea level are shown by the black elliptic contours between 0.5◦and 3.0◦. The SK (which is at 2.5◦ off the beam centre) is slightly off the corresponding contour because it is about 320 m above sea level.
[from <a rel="nofollow" class="external free" href="https://arxiv.org/abs/hep-ph/0607255">https://arxiv.org/abs/hep-ph/0607255</a>, <a rel="nofollow" class="external free" href="https://doi.org/10.1103/PhysRevD.76.093002">https://doi.org/10.1103/PhysRevD.76.093002</a>]
Hyper-Kamiokande Collaboration (K. Abe et al.)
CC BY 4.0
"Physics potentials with the second Hyper-Kamiokande detector in Korea", PTEP 2018 (2018) 6, 063C01, Prog Theor Exp Phys (2018), <a rel="nofollow" class="external free" href="https://arxiv.org/abs/1611.06118">https://arxiv.org/abs/1611.06118</a>, <a rel="nofollow" class="external free" href="https://doi.org/10.1093/ptep/pty044">https://doi.org/10.1093/ptep/pty044</a>