Selecting more than one Grid Value
 
Syntax:
 Field 
 GRID (value) (value) (value) (value) VALUES
 
 
Examples:
  
Selecting 
several random time points in a field  
  
Selecting 
all the Jan months in a field 
Temperature anomaly composite of March-May high precipitation El Nino Years
 
or to select every "X" value
Syntax:
 
Field 
GRID X STEP
Example:
 
Selecting 
every 4th time point in a field 
Troubleshooting:
  
To select every "X" starting with a different point, move the GRID range.