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Table 4 The numerical error on RT1 mixed finite element for state function

From: A priori error estimates for higher order variational discretization and mixed finite element methods of optimal control problems

h Errors
  u - u h Rate p - p h Rate y - y h Rate q - q h Rate z - z h Rate
1/16 1.55e - 03 - 5.68e - 03 - 1.55e - 03 - 5.68e - 03 - 1.55e - 03 -
1/32 3.88e - 04 2.00 1.43e - 03 2.00 3.88e - 04 2.00 1.43e - 03 2.00 3.88e - 04 2.00
1/64 9.69e - 05 2.00 3.58e - 04 1.99 9.69e - 05 2.00 3.58e - 04 1.99 9.66e - 05 2.00
1/128 2.43e - 05 1.99 8.96e - 05 2.00 2.43e - 05 1.99 8.97e - 05 2.00 2.42e - 05 1.99