• The first volume is the keepinvolume with name DR1M1. It sits in the mothervolume SEC1. It's shape is a TRAP and the volume is filled with AIR$. A TRAP has 8 corners given with the x, y, z coordinates in the intrinsic coordinate system of the Driftchamber. This coordinate system has is origin at (0, 392.354, 403.529) relative to the coordinate system of SEC1 (which is the same as the Lab system).It is rotated around the x-axis.
  
  
• The second volume with name D1F1 is a daughter of DR1M1. It's also a TRAP filled with ALUMINIUM$. The 8 corners are given in an own coordinate system with has the same orientation as the coordinate system of DR1M1 but shifted in z-direction.
  

DR1M1
SEC1
TRAP
AIR$
  56.091  -385  -27.5
 453.473   575  -27.5
-453.473   575  -27.5
 -56.091  -385  -27.5
  77.221  -385   25
 474.603   575   25
-474.603   575   25
 -77.221  -385   25
0  392.354  403.529
1  0  0  0  0.716965  0.697109  0  -0.697109  0.716965
// ***********************************************************
D1F1
DR1M1
TRAP
ALUMINIUM$
  53.204  -385  -5
 450.586   575  -5
-450.586   575  -5
 -53.204  -385  -5
  57.229  -385   5
 454.611   575   5
-454.611   575   5
 -57.229  -385   5
0  0  -22.5
1  0  0  0  1  0  0  0  1