By Hongliang Zhang @ 12/06/2012
The files we have now are EC results, they are named EC.2000 to EC.2006.
These files are zip by command "zip -r " in shell environment.
After unzip these files, directories named 2000 to 2006 will show up. 
Each of them contains files for the year of the directory name. 
There are four domains (or regions) over east US (NPB, CD, SP, and WS).Each domain has 24-hour averaged concentrations for all days (except last two days) of a year. Name of the files is in the foramt of 4km_domain.daily.matrix.species.yearday (for example: 4km_cd.daily.matrix.ec.2000001, 2000/4km_cd.daily.matrix.ec.2000101, 2000/4km_cd.daily.matrix.ec.2000364).

In the files, the first three lines are comments starting with #. Line 2 shows the number of rows and number of cols in each domain and Line 3 shows the format used to write out the matrix with Fortran.

The map information of the four domains are given as below:
The map projection is same.
Lat1: 30.000        
Lat2: 60.000 
Center long:      -97.000  
Center lati:     45.000

Detail of the domains: (x,y values of left bottom corner are in lambert based on above map projection )
Domains  x_start_point  y_start_point  x(m)          y(m)       ncols     nrows 
NPB:    1241998.750   -543769.375      4000.000      4000.000   186     120  
CD:      597999.562   -439770.969      4000.000      4000.000   160     95 
SP:      189999.562   -103770.969      4000.000      4000.000   50      50  
WS:     1357998.750   -911769.375      4000.000      4000.000   50      50