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Table 1 The numerical errors on RT0 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 3.63e - 02 - 3.25e - 01 - 7.24e - 02 - 1.63e - 01 - 3.63e - 02 -
1/32 1.80e - 02 1.01 1.62e - 01 1.00 3.63e - 02 0.99 8.12e - 02 1.01 1.80e - 02 1.01
1/64 9.06e - 03 0.99 8.13e - 02 0.99 1.78e - 02 1.03 4.07e - 02 1.00 9.06e - 03 0.99
1/128 4.48e - 03 1.01 4.03e - 02 1.01 8.87e - 03 1.01 2.05e - 02 0.99 4.48e - 03 1.01