Given a pfaces object, reconstruct faces and returns an afaces object.
1  | 
PCA | 
 a pfaces object  | 
pos | 
 a vector of length 2 or a 2-col matrix specifying the position
on the factorail place (xax, yax) to use to reconstruct faces
(  | 
amp | 
 numeric an amplification factor (1 by default)  | 
xax | 
 integer which PC to use as the 1st axis (1st by default)  | 
yax | 
 integer which PC to use as the 2nd axis (2nd by default)  | 
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