A description of each variable can be found in the BBIRD protocol

CompNID
NID
Nsttype
SType
Distance
N0
E0
S0
W0
N10
E10
S10
W10
N20
E20
S20
W20
N30
E30
S30
W30
N40
E40
S40
W40
N50
E50
S50
W50