F214 Interpolation
For the purposes of flight planning during PPL training (Qualifying cross country tomorrow, hopefully!) can someone please explain to me how to interpolate correctly for wind velocity at altitudes BETWEEN the levels given in the wind 'boxes' on the F214 (e.g. for 3000 ft), and then between adjacent boxes, should this be necessary. I've never fully understood the procedure involved and I'd be grateful for some guidance. Or, am I being too pedantic (bearing in mind again that I'm still a student)?