These data files accompany the paper by Eglen and Wong (2008) Visual
Neuroscience 25:209-213.  Thanks to Prof Heinz Wässle for providing
this data.

For each field X, there are three files:
X1.txt -  type 1 neuronal positions
X2.txt -  type 2 neuronal positions
Xb.txt -  bounding box of field [xlo xhi] on line 1, [ylo yhi] on line 2.

Units on all measurements are microns (um).

The R script read_hor.R should regenerate the fields, shown in 
the file hor_maps.pdf