anchor.diff:            // column for the property value and one column for the percent
             // change.
             each prop in properties[group]
  -            colgroup.qi-prop-group
  +            colgroup.qi-colgroup
                 col
                 col
             
  
positive.code: //- The group headings.
  - headings = { 'ktrans': 'Vascular Permeability Transfer Constant (K<sup>trans</sup>)', 've': 'Extravascular Extracellular Volume Fraction (v<sub>e</sub>)', 'taui': 'Intracellular H<sub>2</sub>O Mean Lifetime (&tau;<sub>i</sub>)' }
  //- The group properties.
  - properties = { 'ktrans': ['deltaKTrans', 'fxlKTrans', 'fxrKTrans'], 've': ['v_e'], 'taui': ['tau_i'] }
  //- The group column headings.
  - columns = { 'deltaKTrans': '&Delta;K<sup>trans</sup>', 'fxlKTrans': 'FXL K<sup>trans</sup>', 'fxrKTrans': 'FXR K<sup>trans</sup>', 'v_e': 'V<sub>e</sub>', 'tau_i': 'T<sub>i</sub>'}
  
  
negative.code:               td.qi-date= '{{ sess.acquisitionDate | moment }}'
                each prop in properties[group]
                  // The property value with four decimals.
                  td.qi-number= '{{ sess.modeling.' + prop + '.average | number:4 }}'
                  // The percent change without decimals.
                  td.qi-pct= '{{ sess.modeling.' + prop + 'PctChange | number:0 }}'
  