Limitations of the use of the vertical cut-off to calculate cosmic-ray propagation in the Earth's atmosphere.

In the second sentence of page 259, which says ‘However, this will “underestimate” the cosmic-ray flux entering the atmosphere.’ the word ‘underestimate’ should be ‘overestimate’. Also, in the next to last sentence on page 260, which says ‘The use of the vertical cut-off alone over the entire 2-solid angle of incidence of the primary cosmic radiation will “underestimate” the incident cosmic-ray flux, with the “underestimate” largest at the geomagnetic equator’, again ‘underestimate’ should be ‘overestimate’.