code: def select_step24(
      v1, v2, nv, include_last=True, threshold_factor=3600
  ):
      v1, v2 = v1 / 15, v2 / 15
      levs, n, factor = select_step(
          v1,
          v2,
          nv,
          hour=True,
          include_last=include_last,
          threshold_factor=threshold_factor,
      )
      return levs * 15, n, factor
  
imports: import numpy
  import math
  from mpl_toolkits.axisartist.grid_finder import ExtremeFinderSimple
label_desc: Use image node_id 5 for calling a global function with example usage: select_step24(v1, v2, nv, include_last, threshold_factor) and returns: unknown,  n,  factor