code: def load_probe(name):
      
      if op.exists(name):
          # The argument can be either a path to a PRB file.
          path = name
      else:
          # Or the name of a built-in probe.
          curdir = op.realpath(op.dirname(__file__))
          path = op.join(curdir, 'probes/{}.prb'.format(name))
      if not op.exists(path):
          raise IOError("The probe `{}` cannot be found.".format(name))
      return MEA(probe=_read_python(path))
docs: Load one of the built-in probes.