In theory:
 
2) Computing atmospheric models at different magnetic inclinations
1) Assuming B-field topology and computing surface temperature profile
3) Ray-tracing in the strong gravitational field.
+
+
=
4) Predicting:
a) lc and b) spin 
variation of the line parameters!
GOAL: probe the surface properties of the NS via timing and pulse-phase spectroscopy of cyclotron lines!
q = 0š
q = 40š
q = 80š