CREATE TABLE table_73108 ("C_{low}" TEXT, "C_{high}" TEXT, "I_{low}" FLOAT, "I_{high}" FLOAT, "Category" TEXT)

In how many different categories is the value of C_{low} 35.5?
SELECT COUNT("Category") FROM table_73108 WHERE "C_{low}" = '35.5'
SELECT COUNT("Category") FROM "table_73108" WHERE "C_{low}" = '35.5'