CKXMIN    CKXMIN    CKXMIN    CKXMIN    CKXMIN    CKXMIN    CKXMIN    
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SUBROUTINE CKXMIN (X, NN, XMIN, IMIN)
Returns the minimum value in an array and its location in the array.

INPUT
X(*)      - Real array.
NN        - Integer scalar; size of X.
OUTPUT
XMIN      - Real scalar.
IMIN      - Integer scalar; location in X of XMIN.