code: def build_kal_scan_band_string(kal_bin, band, args):
      
      option_mapping = {"gain": "-g",
                        "device": "-d",
                        "error": "-e"}
      if not sanity.scan_band_is_valid(band):
          err_txt = "Unsupported band designation: %" % band
          raise ValueError(err_txt)
      base_string = "%s -v -s %s" % (kal_bin, band)
      base_string += options_string_builder(option_mapping, args)
      return(base_string)
docs: Return string for CLI invocation of kal, for band scan.