CDC hits in MC data

["Mark M. Ito" <marki@jlab.org>]

Software Gurus,

I am trying to get cdc data to use in my track fitter. If I do an 
hd_dump on the hddm file Simon graciously provided, I see the 
information listed below. My questions:

What are the units of t?
Do I need to know some other reference time?
How to I get the geometry information for ring 3, straw 13?

What I really need of course is a pointer to the documentation of 
course. Thanks in advance!

  -- Mark

DCDCHit:
 ring: straw:    dE:    t:
--------------------------
    1     10  0.000    60
    2     11  0.000    73
    3     13  0.000    86
    4     16  0.000    95
    5     17  0.000    37
    6     16  0.000   101
    7     17  0.000    47
    8     22  0.000   127
    9     23  0.000    20
   10     25  0.000   127
   11     26  0.000    23
   12     28  0.000   120
   13     30  0.000   105
   14     32  0.000    43
   15     31  0.000     7
   16     33  0.000   133
   17     36  0.000    41
   18     38  0.000    91
   19     39  0.000    74
   20     41  0.000    55
   21     42  0.000   114
   22     44  0.000    11
   23     46  0.000   132
   24     47  0.000    43
   25     49  0.000    78