COunt the sum of Diameter (km) which has a Latitude of 62.7n?
CREATE TABLE "fossae" (
  "name" text,
  "latitude" text,
  "longitude" text,
  "diameter_km" real,
  "year_named" real,
  "name_origin" text
);
SELECT SUM("diameter_km") FROM "fossae" WHERE "latitude"='62.7n';