For a given delta lnL, get the convex hull (blob encircling the points) for two dimensions
1  | GetConvexHull(threshold = 2, df, height, x, y)
 | 
threshold | 
 What value to exclude numbers worse than  | 
df | 
 The data.frame  | 
height | 
 The variable name to use for the height threshold  | 
x | 
 The first variable to look at for the hull  | 
y | 
 The second variable to look at for the hull  | 
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