44 
C27 T m / Hopan 
—•— All crudes 
—■— Middle East 
Iloith Sea 
Fig. 36: Ratios of Tm(C27) to hopane sorted in ascending order. Middle East crudes (53 
samples) are marked with violet squares, whereas North Sea crudes (85 samples) are 
shown by a yellow triangle. 
C29 / Hopan 
—♦— All ciudes 
—■— Middle East 
Ilorth Sea 
Fig. 37: Ratios of norhopane(C29) to hopane sorted in ascending order. Middle East crudes 
(53 samples) are marked with violet squares, whereas North Sea crudes (85 samples) 
are shown by a yellow triangle.