SIGMA.TXT
(Compiled by TC)
Description
SIGMA.TXT is made by densify and is located in the SHAPEFILES/ directory. This file is essentially a copy of the most recently made ICQ shape file SHAPE.TXT, with a fourth column of sigma values.
First line is Q (resolution). This gives the number of nodes for i and j. Multiple it by 6 coordinate vector spaces to fill out the entire region. Note: Q*Q*6 is the total number of nodes, and line entries in this file. A Q of 512 is the largest that we represent. It contains 1.5 million vertices and 56 MB uncompressed.
Second line and following: The location of a vertex in i, j, k space (Cartesian coordinates), and the sigma value.
Example of SIGMA.TXT
512 0.00810 0.19764 0.13333 0.29844E-01 0.00871 0.19742 0.13360 0.28206E-01 0.00932 0.19721 0.13386 0.27425E-01 0.00994 0.19700 0.13414 0.27743E-01 0.01055 0.19677 0.13441 0.28415E-01 0.01116 0.19655 0.13466 0.31917E-01 0.01177 0.19633 0.13493 0.31631E-01 0.01239 0.19615 0.13521 0.28469E-01 0.01300 0.19594 0.13549 0.28856E-01