               (current - previous)/previous * 100
           
             # Return an object with the change properties.
-            delta_k_trans_pct_change: percent_change(current.delta_k_trans, previous.delta_k_trans)
-            fxl_k_trans_pct_change: percent_change(current.fxl_k_trans, previous.fxl_k_trans)
-            fxr_k_trans_pct_change: percent_change(current.fxr_k_trans, previous.fxr_k_trans)
+            deltaKTrans_pct_change: percent_change(current.deltaKTrans, previous.deltaKTrans)
+            fxlKTrans_pct_change: percent_change(current.fxlKTrans, previous.fxlKTrans)
+            fxrKTrans_pct_change: percent_change(current.fxrKTrans, previous.fxrKTrans)
             v_e_pct_change: percent_change(current.v_e, previous.v_e)
             tau_i_pct_change: percent_change(current.tau_i, previous.tau_i)
         

            {
              label: 'FXL Ktrans'
              color: 'BurlyWood'
              accessor: (session) -> session.modeling.fxl_k_trans
            }
            {
              label: 'FXR Ktrans'
              color: 'OliveDrab'
              accessor: (session) -> session.modeling.fxr_k_trans
            }
          ]
      ve:

    # The common modeling x-axis specification.
    x =
      label: 'Visit Date'
      accessor: (session) -> session.acquisitionDate.valueOf()

    # The chart-specific y-axis specifications.
    y =
