class AliITSpListItem: public TObject

 Default constructor
 Inputs:
    none.
 Outputs:
    none.
 Return:
    A zeroed/empty AliITSpListItem class.

 Standard noise constructor
 Inputs:
    Int_t module   The module where this noise occurred
    Int_t index    The cell index where this noise occurred
    Double_t noise The value of the noise.
 Outputs:
    none.
 Return:
    A setup and noise filled AliITSpListItem class.

 Standard signal constructor
 Inputs:
    Int_t track     The track number which produced this signal
    Int_t hit       The hit number which produced this signal
    Int_t module    The module where this signal occurred
    Int_t index     The cell index where this signal occurred
    Double_t signal The value of the signal (ionization)
 Outputs:
    none.
 Return:
    A setup and signal filled  AliITSpListItem class.

 this method resets all the data members and initializes the
 object as in the constructor which has the same arguments

 this method resets all the data members and initializes the
 object as in the constructor which has the same arguments

 this method resets all the data members and initializes the
 object as in the constructor which has the same arguments

 Destructor
 Inputs:
    none.
 Outputs:
    none.
 Return:
    A properly destroyed AliITSpListItem class.

 = operator
 Inputs:
    AliITSpListItem &source   A AliITSpListItem Object
 Outputs:
    none.
 Return:
    A copied AliITSpListItem object

 Copy operator
 Inputs:
    AliITSpListItem &source   A AliITSpListItem Object
 Outputs:
    none.
 Return:
    A copied AliITSpListItem object

 Adds this track number and signal to the pList and orders them
 Inputs:
    Int_t track     The track number which produced this signal
    Int_t hit       The hit number which produced this signal
    Int_t module    The module where this signal occurred
    Int_t index     The cell index where this signal occurred
    Double_t signal The value of the signal (ionization)
 Outputs:
    none.
 Return:
    none.

 Adds noise to this existing list.
 Inputs:
    Int_t module   The module where this noise occurred
    Int_t index    The cell index where this noise occurred
    Double_t noise The value of the noise.
 Outputs:
    none.
 Return:
    none.

 Adds signal after electronics to this existing list.
 Inputs:
    Int_t module   The module where this noise occurred
    Int_t index    The cell index where this noise occurred
    Double_t signal The value of the signal.
 Outputs:
    none.
 Return:
    none.

 Adds the contents of pl to this
 pl could come from different module and index
 Inputs:
    AliITSpListItem *pl  an AliITSpListItem to be added to this class.
 Outputs:
    none.
 Return:
    none.

 Adds the contents of pl to this with track number off set given by
 fileIndex.
 Inputs:
    Int_t fileIndex      track number offset value
    AliITSpListItem *pl  an AliITSpListItem to be added to this class.
 Outputs:
    none.
 Return:
    none.

 Shift an index number to occupy the upper four bits. No longer used.
 Inputs:
    Int_t in   The file number
    Int_t trk  The track number
 Outputs:
    none.
 Return:
    Int_t The track number with the file number in the upper bits.

Standard output format for this class
 Inputs:
    ostream *os  The output stream
 Outputs:
    none.
 Return:
    none.

 Standard output streaming function.
 Inputs:
    istream *is The input stream
 Outputs:
    none.
 Return:
    none.

 Returns the signal value in the list of signals

 Returns the Sum/Total signal

 Returns the  noise

 Returns the number of stored singals.

 Returns track number.

 Returns hit number.

 Returns module number.

 Returns index number.

 Standard ascii class print function

 Standard ascii class read function

 Check if the item is used or marked as unused

 Mark the object as unused

 Returns max size of array for for Tracks, Hits, and signals.