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  1. or download this
    | Zp (peak)
|\
...
|                  \ 
|-------------------\ (Xd,Yd)
(Xp,Yp)
  2. or download this
    Ha   Hb   Hc   Hd
-- = -- = -- = --
Ba   Bb   Bc   Bd
  3. or download this
    Ha   Hb
-- = --
...
Hb   Hc
-- = --
Bb   Bc