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Table 3 The numerical error 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 3.66e - 02 - 1.63e - 01 - 3.67e - 02 - 1.63e - 01 - 3.66e - 02 -
1/32 1.79e - 02 1.03 8.14e - 02 1.00 1.79e - 02 1.04 8.14e - 02 1.00 1.79e - 02 1.03
1/64 8.94e - 03 0.99 4.09e - 02 0.99 8.94e - 03 0.99 4.09e - 02 0.99 8.94e - 03 0.99
1/128 4.50e - 03 0.99 2.04e - 02 1.00 4.46e - 03 1.00 2.04e - 02 1.00 4.50e - 03 0.99