code: def _raw_at_zoom(config, zooms):
      
      params_per_zoom = {}
      for zoom in zooms:
          params = {}
          for name, element in config.items():
              if name not in _RESERVED_PARAMETERS:
                  out_element = _element_at_zoom(name, element, zoom)
                  if out_element is not None:
                      params[name] = out_element
          params_per_zoom[zoom] = params
      return params_per_zoom
docs: Return parameter dictionary per zoom level.