recorder of zeroLengthSection

[carnatin]

<TimeOutput>
<ResponseType>time</ResponseType>
</TimeOutput>
<ElementOutput eleType="ZeroLengthSection" eleTag="1" node1="2" node2="1">
<ResponseType>e1</ResponseType>
<ResponseType>e2</ResponseType>
<ResponseType>e3</ResponseType>
</ElementOutput>
<Data>
0 0 0 0
0.1 -4.1855e-037 -1.351e-029 3.22667e-045
0.2 9.30851e-036 -7.33187e-028 1.75112e-043
0.3 9.80262e-037 1.17221e-027 -2.79967e-043
0.4 1.4119e-035 -1.19504e-027 2.85418e-043
0.5 -1.75592e-035 6.05253e-027 -1.44557e-042
0.6 -4.33797e-035 1.69911e-027 -4.0581e-043

what is e1 e2 e3?

[fmk]

they are the section deformations in 1 2 a nd 3 directions, or the difference in nodal displacements in local 1,2 and 3 directions.

[carnatin]

Thanks!
This is the recorder(3D):
recorder Element -file secforce.out -time -ele 1 deformation
1,2,3 correspond to x,y,z? or x,z,y?

in 2D
# Tag DX DY RZ
fix 1 1 1 1
fix 2 0 1 0
# Create nodes
# tag X Y
node 1 0.0 0.0
node 2 0.0 0.0
element zeroLengthSection 1 1 2 2
<TimeOutput>
<ResponseType>time</ResponseType>
</TimeOutput>
<ElementOutput eleType="ZeroLengthSection" eleTag="1" node1="1" node2="2">
<ResponseType>e1</ResponseType>
<ResponseType>e2</ResponseType>
</ElementOutput>
<Data>
0 -0.000216968 -7.34889e-022
4.20436 -0.000218752 8.90678e-006
8.38195 -0.000221072 1.78791e-005
12.3938 -0.000215815 2.89767e-005

e1 is the axial strain(x direction)
and e2 is the rotation about z,right?