Geometry of the pulsar and main parameters of the RVM. The pulsar angular momentum, Ω_p, makes an angle i_p with respect to the line of sight (along vector o). The angle θ_p is between magnetic dipole, B, and the NS angular momentum Ω_p. Pulsar phase ϕ is the azimuthal angle of vector B in the plane (x, y) perpendicular to Ω_p. The position angle χ_p is the angle measured counterclockwise between the direction to the north N and the projection of Ω_p on the plane of the sky (N-E).