6700t en-route
 

What does this mean on an en-route chart?

I know a T before the altitude represents a low altitude RNAV airway but have not the faintest idea what a t after represents.

Thanks

MOCA on Jeppesen charts.

MINIMUM OBSTRUCTION CLEARANCE ALTITUDE (MOCA) — The lowest published altitude in effect between radio fixes on VOR airways, off airway routes, or route segments which meets obstacle clearance requirements for the entire route segment and in the USA assures acceptable navigational signal coverage only within 22NM of a VOR.

http://ww1.jeppesen.com/download/aopa/dec-aopa.pdf