class AtlTRTDigit: public HepDriftChamberDigit

 Default constructor

 Normal constructor

 Default destructor

 Clear this object

 Print out TRT hit

 Options available:
   "nohead" - No header containing the variable names is
              displayed. Useful when printing a whole table
              for a list of TRT hits

 Print information header

 Print footer

 Check if hit is a high-threshold hit

 Check whether a bit is set. Choose the bit in the
 range: 0 < bit < 28.

 Returns the first set LT bit in the digit. 1 < bit < 24.

 Returns the last set LT bit in the digit. 1 < bit < 24.

 Return the leading edge of the signal. For the time being this
 is just the same as FirstSetBit(), but we might want to change
 this in the future.

 Return the trailing edge of the signal. For the time being this
 is just the same as LastSetBit(), but we might want to change
 this in the future.

 Returns the number of transitions in the digit.
 A transition here means a change in the state
 of low threshold bits along the bitpattern.

 The following digit has 5 transitions:

          000011111110001111110011

 Returns the number of islands in the digit.
 An island here means a group of subsequenly
 set bits in the bitpattern.

 The following digit has 3 islands:

          000011111110001111110011

 Returns the number of zeros in a given hole.

 returns the Time-Over-Threshold of a TRT hit. The option string
 determines which definition should be used to calculate the
 Time-Over-Threshold. The following definitions are available:

    A) "ctb"    - Definition as to Athena 12.0.6 and Combined Test Beam
    B) "smpl"   - Most simple Time-over-Threshold definition
    C) "prsnt"  - The present official Time-over-Threshold definition


  A) "ctb"

 This is the standard Time-Over-Threshold of a TRT hit as defined for
 Combined Test Beam or Athena 12.0.6. The procedure is as follows:

 1) We look for a valid trailing edge which in this case is the
    very last set bit.
 2) We look for a valid leading edge which in this case is the
    first set bit.
 3) We consider all bits in between the leading and trailing edge set.
    The Time-over-Threshold hence is the number of these bits multiplied
    by 3.125 ns.


  B) "smpl"

 This is the most simple definition. We count all set bits and multiply
 the result by 3.125 ns. We do not care about leading edges in the very
 first or trailing edges in the very last bit.


  C) "prsnt"

 This definition is similar to definition A) but the trailing edge
 is not allowed to be situated in the very last (the 24th) time bin.
 This is the present official Time-over-Threshold of the TRT hits.