The poster boards will have a single surface measuring 4' x 4' (1.22 m x 1.22 m) so they will accommodate an ARCH E or A0 sized poster in either landscape or portrait orientation.

PAC09 SPMS: http://appora.fnal.gov/pls/pac09/profile.html

JACoW: http://JACoW.org/

For detailed instructions see the main links above.