File Name Convention
--------------------
The only file in this data set is named "c4_percent_1d.asc". This file provides 
the percentage of vegetation (0-100) in each 1 degree grid cell (lat./long.) 
which possesses the C4 photosynthetic pathway.

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ASCII Data Format
-----------------
All of the files in the ISLSCP Initiative II data collection are in the ASCII, 
or text format. The file format consists of numerical fields of varying length, 
which are delimited by a single space and arranged in columns and rows. The data 
file c4_percent_1d.asc contains 360 columns and 180 rows. All values in this 
file are written as real numbers. A value of -999 is used to indicate cells with 
no data.

All files are gridded to a common equal-angle lat/long grid, where the 
coordinates of the upper left corner of the files are located at 180 degrees W, 
90 degrees N and the lower right corner coordinates are located at 180 degrees E, 
90 degrees S. Data in the files are ordered from North to South and from West to
East beginning at 180 degrees West and 90 degrees North.