Read NGF File

Purpose: To read a previously written NGF file.
Card: 
    _________________________________________________________________
    /2|  5|   10|   15|   20|    30|    40|    50|    60|    70|    80|
   /  |   |     |     |     |      |      |      |      |      |      |
  |   |   |     |     |     |      |      |      |      |      |      |
  |GF |I1 |     |     |     | blank| blank| blank| blank| blank| blank|
  |   |   |     |     |     |      |      |      |      |      |      |
  |   |   |  b  |  b  |  b  |      |      |      |      |      |      |
  |   |   |  l  |  l  |  l  |      |      |      |      |      |      |
  |   |   |  a  |  a  |  a  |      |      |      |      |      |      |
  |   |   |  n  |  n  |  n  |      |      |      |      |      |      |
  |   |   |  k  |  k  |  k  |      |      |      |      |      |      |
  |   |   |     |     |     |      |      |      |      |      |      |
  |   |   |     |     |     |      |      |      |      |      |      |
  |  The numbers along the top refer to the last column in each field |
  |   |   |     |     |     |      |      |      |      |      |      |
Parameters:
Integers
(I1) - Prints a table of the coordinates of the ends of all segments in the NGF if I1 not equal to 0. Normal printing otherwise.
Notes