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Table 2 The numerical errors 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 1.25e - 03 - 7.13e - 03 - 2.50e - 03 - 3.53e - 03 - 1.25e - 03 -
1/32 3.13e - 04 2.00 1.76e - 03 2.02 6.24e - 04 2.00 8.82e - 04 2.00 3.13e - 04 2.00
1/64 7.68e - 05 2.02 4.43e - 04 1.99 1.56e - 04 2.00 2.23e - 04 1.98 7.68e - 05 2.02
1/128 1.90e - 05 2.01 1.12e - 04 1.98 3.89e - 05 2.00 5.52e - 05 2.01 1.90e - 05 2.01