PROCESSORS_MAP
BEGIN
coupler
Multi_Comp_Start
2
ice   0  2
land  1  3
Multi_Comp_End
Multi_Comp_Start
2
ocean   0  2
atmosphere 3  5
Multi_Comp_End
END 
ADD any comments in this line and below.
  for multiple components in single executable, 
  include component info between Multi_Comp_Start
  and Multi_Comp_End, list the number of components,
  and each component's relative processor_id in
  that executable world.