English: 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 https://arxiv.org/abs/hep-ph/0607255, https://doi.org/10.1103/PhysRevD.76.093002]