CalcXP: Calculate Horizontal Travel
In TauP.R: Earthquake Traveltime Calculations for 1-D Earth Models

Description Usage Arguments Details Value Author(s) Examples

Calculates horizontal travel within a single layer.

1	CalcXP(p, v, z, zmin, zmax, novertex)

`p`	Ray Parameter (s/deg)
`v`	Velocity at top and bottom of layer (km/s)
`z`	Depth at top and bottom of layer (km)
`zmin`	Minimum allowed depth (km)
`zmax`	Maximum allowed depth (km)
`novertex`	Block handling of vertices if TRUE.

All depths and velocities must be flat earth transformed. This is a subordinate routine for CalcXPsum. Regrettably, this is not vectorized; this will be corrected in later editions.

Horizontal distance traveled in layer in flat earth coordinates.

Jake Anderson