Top panel: the decay of maximum magnetic ﹩{B}_{{\rm{\max }}}=4\times 1{0}^{13}﹩ G with time for WD1 and WD2 with radius 5708 and 2815 km, respectively. Middle: magnetic field as a function of radius, before and after magnetic field decay for toroidal field (WD1). Bottom panel: same as the middle panel, except for poloidal field (WD2).