def timePoint_hierarchy(nb_TP):
  """
  Convert the number of time points in a list with all the time points. This list can be used by 
  many others functions.
  
  The time points columns in the input dataset should be write like : "tp* s"
  * is the time point number (the first time point must be 1).
  
  @type  nb_TP: int
  @param nb_TP: the number of time points
  @rtype      : list
  @return     : all the time points name (string)
  """
  TPs = []
  for i in range(nb_TP):
    TP_name = "tp" + str(i+1) + " s"
    TPs.append(TP_name)
  return TPs