Program: MKLSEMPTYTRAVELTIMES

  mklsemptytraveltimes.........create empty travel times structure
 
  call: traveltimes=mklsemptytraveltimes;
 
  result: traveltimes: (structure array)
                       universal travel time structure, denoting travel
                       times from specified points to specified stations
                       for specified phases.
                       The structure contains the following fields:
 
                       .layerid: (number) []
                                 ID of the layer from which the nodes in
                                 NODEID are
                       .nodeid: (numeric array) []
                                List of IDs of the nodes for which the 
                                travel times were computed
                       .phase: (string array)
                               list of strings denoting the phases for which
                               the travel times were computed
                       .station (string array)
                               list of strings denoting the stations for
                               which the travel times were computed
                       .d:     (numeric array) [deg]
                               list of the epicentral distances of the
                               nodes
                       .tt:    (numeric array) [s]
                               list of the travel times themselves
 
                       traveltimes.nodeid(n) is the ID of the n-th node for
                       which travel times were computed. The corresponding
                       phase name is traveltimes.phase(n,:) and the travel
                       time itself is traveltimes.tt(n), in seconds.
 
                       By organizing the structure this way, it is easy to
                       search for a certain node ID, phase name or travel
                       times within a certain range.
 
                       
 
  Martin Knapmeyer, 12.04.2005, 17.05.2005

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