1- Absorption: done actually by absorb any stray reactance into the impedance-matching network itself so you can decrease the value of the component, element capacitors are placed in parallel with stray capacitances, and element inductors are placed in series with any stray inductances. The stray component values are then subtracted from the calculated element values, leaving new element values (C┐, L┐), which are smaller than the calculated element values.