Name the least horizontal for smpte 259m three quarters
CREATE TABLE "table1_272313_2" (
  "vertical" real,
  "horizontal" real,
  "aspect_ratio" text,
  "pixel_aspect_ratio" text,
  "scanning" text,
  "frame_rate_hz" text
);
SELECT MIN("horizontal") FROM "table1_272313_2" WHERE "pixel_aspect_ratio"='SMPTE 259M three quarters';