What do you mean by total deductions under chapter VI-A ?

Under Chapter VIA deductions specified in sections 80C to 80U are allowed from the gross total income in order to arrive at the net income. The aggregate amount of the deductions under these sections cannot, however, exceed the gross total income. These deductions are available to assessee for deposits in many investment schemes and also for expenditure of a particular nature .This is a part of Form 16 where amount qualified for deduction under chapter VIA is shown under the heads like contribution to Statutory Provident Fund, Recognized Provident Fund, Medical Insurance Premium, LIC premium, Donations, Housing & educational loans etc.