active OPENLC_NAMERICA1 and 2?

[TextRich]

Hello!  I apologize if this has been answered somewhere in this forums (I couldn't find it).  I use openLC North America.  In my FSX Scenery Library, there are Orbx!OPENLC_NAMERICA1 and Orbx!OPENLC_NAMERICA2.  Do #1 and #2 pertain to regions, and if so, which regions?  I am hoping to be able to uncheck one of them if I fly in a North American region that does not use the unchecked scenery.  For example if 1 is for eastern half and 2 is for western half and I am flying in New York, I can uncheck 2 and save on FSX's limited RAM and also loading time.  Thank you in advance for any explanation.