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Figure B4 - 15. The Crossover Point 
14, Temperature-Ordinate Value. Read the temperature ordinate val- 
ue to the nearest one-tenth at the intersection of the left edge of the 
temperature trace and the horizontal lines drawn in accordance with 
§B4-6.1. When a level is drawn between two temperature contacts, draw 
a line between the top edge of the lower and bottom edge of the upper. 
At the intersection of this line withthe horizontal line, read the temper- 
ature ordinate pertaining to the level. When the level is drawn in an 
adjusted low reference, correct the lower temperature-ordinate before 
connecting these temperature traces. When the lapse rate is not uniform 
(base and top of inversions, etc.), and a level must be placed between 
temperature traces because of relative humidity change or selecting a 
common level between charts, use the ordinate value of the top of the 
lower temperature contact as the temperature for the level. This type of 
selection of levels should be avoided where possible by using instruc- 
tions in JB4-6.7. 
Enter the temperature-ordinate values to tenths immediately above the 
level to the right of the temperature trace. 
S69 FMH#3 
