What was the max character (per page row) of the encoding with a bit rate of 6.203?
CREATE TABLE "teletext_binary_nrz_encodings" (
  "standard" text,
  "color_system" text,
  "informational_cvbs_lines" text,
  "bit_rate_mbit_s" text,
  "waveform" text,
  "bits_per_line_including_run_in" real,
  "max_characters_per_page_row" real
);
SELECT MAX("max_characters_per_page_row") FROM "teletext_binary_nrz_encodings" WHERE "bit_rate_mbit_s"='6.203';