(The following text formerly appeared as section 2.7 of TR 100.
It describes how to introduce boundary conditions by way of PIL
entries in the Q1 file.
Boundary conditions may be introduced by way of the SATELLITE
(a) The general idea
(b) Treatment inside EARTH
(c) Special cases
(d) Mass-flow boundary conditions
(e) Convective and diffusive sources for j
(f) Improved specification of boundary conditions in general menu