longf360.ease.asc
--------------

Longitude in decimal degrees in the range 0-360

Greenwhich is 0 with values increasing to the east
until 360 is reached back at Greenwhich.



longf180.ease.asc
-----------------

Longitude in decimal degrees in the range (-180 to +180).

Greenwhich is 0 with values increasing to the east
and decreasing to the west until +180 or -180 is 
reached in the Pacific Ocean.