A - Curtain Width - Pole length between inner edges of finials or rail from end to end
B - Window Width (O.R) - Outer edge of window or outside recess
C - Window Width (I.R) Inside recess
D - Window Drop (I.R) - Inside recess
E - Window Drop (O.R) - Outer edge of window or outside recess
F - Curtain Drop - From bottom of pole or top of rail to top of sill
G - Curtain Drop - From bottom of pole or top of rail to finished length required