Name the lower index kcal/ nm3 for 61.32
CREATE TABLE "wobbe_index_of_common_fuel_gases" (
  "fuel_gas" text,
  "upper_index_kcal_nm_3" real,
  "lower_index_kcal_nm_3" real,
  "upper_index_mj_nm_3" text,
  "lower_index_mj_nm_3" text
);
SELECT "lower_index_kcal_nm_3" FROM "wobbe_index_of_common_fuel_gases" WHERE "upper_index_mj_nm_3"='61.32';