CREATE TABLE table_203_613 (id NUMBER, "formula" CLOB, "color" CLOB, "symmetry" CLOB, "space group" CLOB, "no" NUMBER, "pearson symbol" CLOB, "a  ( pm ) " NUMBER, "b  ( pm ) " NUMBER, "c  ( pm ) " NUMBER, "z" NUMBER, "density ,  g/cm3" NUMBER)

what is the total combined density of pao and pao2 ?
SELECT SUM("density, g/cm3") FROM table_203_613 WHERE "formula" IN ('pao', 'pao2')
SELECT SUM("density, g/cm3") FROM "table_203_613" WHERE "formula" IN ('pao', 'pao2')