# Flag table 3.4 - Scanning mode
1 0 Points of first row or column scan in the +i (+x) direction 
1 1 Points of first row or column scan in the -i (-x) direction 
2 0 Points of first row or column scan in the -j (-y) direction 
2 1 Points of first row or column scan in the +j (+y) direction 
3 0 Adjacent points in i (x) direction are consecutive 
3 1 Adjacent points in j (y) direction is consecutive 
4 0 All rows scan in the same direction 
4 1 Adjacent rows scans in the opposite direction 
# 5-8 Reserved 
