x1 = FITC_Dextran_three_compartment_model_compartment_1
x2 = FITC_Dextran_three_compartment_model_compartment_2
x3 = FITC_Dextran_three_compartment_model_compartment_3
x4 = FITC_Dextran_nine_compartment_model_compartment_4
x5 = FITC_Dextran_nine_compartment_model_compartment_5
x6 = FITC_Dextran_nine_compartment_model_compartment_6
x7 = FITC_Dextran_nine_compartment_model_compartment_7
x8 = FITC_Dextran_nine_compartment_model_compartment_8
x9 = FITC_Dextran_nine_compartment_model_compartment_9