These are the rows of Z values of the grid, organized in row order.

Each row has a constant Y coordinate. Grid row 1 corresponds to ylo and the

last grid row corresponds to yhi. Within each row, the Z values are arranged from xlo to xhi.

The following example grid file is 64 rows high by 64 columns wide.

The first five lines of the file contain header information.

X ranges from 0 to 63, Y ranges from 0 to 63, and Z ranges from -44.71 to 39.05.

The first Z value shown corresponds to the lower left corner of the map and the

following values correspond to the increasing X positions along the bottom row of the grid file.

This file has a total of 4096 Z values. -Magnitude-magnetic transform routines written in Matlab