`void normalize_picture(float **pic, int pdim)`

This function is used to normalize the TF map so that the pixel values
lie between zero and unity. In other words the maximum value is set to
unity and the minimum to zero and the rest of the values are scaled
uniformly. This function is useful since the routine `plottf()`
requires the pixels of the TF maps to lie between zero and unity.
The arguments are:

`float **pic`: Input/Output. The pointer to the TF map.`int pdim`: Input. The size of the TF map.

Author: R. Balasubramanian, bala@chandra.phys.uwm.edu

Bruce Allen 2000-11-19