bands. The genus measured from the ILC, TCM, and Wiener filtered TCM also show features similar to those of WMAP Q, V, and W band maps (Fig. 1$b$). Table 1 summarises the genus-related statistics, namely the genus amplitude ($A$), the shift ($\Delta\nu_{-}$ and $\Delta\nu_{+}$), and the asymmetry ($\Delta g$) parameters for the observed WMAP CMB maps of different bands. The measured genus shifts at both negative and positive threshold levels as well as the genus asymmetry are very small.

[lcccc]{} Maps & $A$ & $\Delta\nu_{-}$ & $\Delta\nu_{+}$ & $\Delta g$\
\
WMAP Q &$832\pm25$ & $+0.003\pm0.015$ & $-0.006\pm0.015$ & $-0.002\pm0.020$\
WMAP V &$1351\pm34$ & $+0.007\pm0.012$ & $-0.010\pm0.012$ & $-0.001\pm0.016$\
WMAP W &$1992\pm44$ & $+0.012\pm0.010$ & $-0.013\pm0.011$ & $-0.001\pm0.014$\
WMAP W (North) & $2002\pm64$ & $+0.011\pm0.014$ & $-0.013\pm0.014$ & $-0.001\pm0.019$\
WMAP W (South) & $1986\pm59$ & $+0.012\pm0.014$ & $-0.013\pm0.015$ & $-0.001\pm0.020$\
\
WMAP W & $1950\pm52$ & $+0.014\pm0.012$ & $-0.017\pm0.013$ & $-0.001\pm0.017$\
WMAP W (North)& $1957\pm75$ & $+0.014\pm0.018$ & $-0.016\pm0.018$ & $-0.001\pm0.023$\
WMAP W (South)& $1947\pm72$ & $+0.014\pm0.018$ & $-0.016\pm0.019$ & $-0.001\pm0.025$\

To quantify the significance level for the non-Gaussianity from the measured genus shift and asymmetry, we simulate 500 WMAP Gaussian CMB maps for each differencing assembly at each band. 