code: def _get_axis_dims(self, element):
      if "spike_length" in self.lookup_options(element, "plot").options:
          return [element.dimensions()[0], None, None]
      return super()._get_axis_dims(element)
  
imports: import numpy
  from ..core import Dataset, Dimension, util
  from ..element import Bars, Graph
  from ..element.util import categorical_aggregate2d
  from .util import get_axis_padding
label_desc: Use image node_id 1 for calling the SpikesMixin obj's underlying member method code with example usage: obj._get_axis_dims(element) and returns: super, list