Fig. 4From: Portfolio diversification benefits before and during the times of COVID-19: evidence from USASource: Author’s own computationContinuous wavelet transform-Islamic indices returns. Note: Wavelet coherence maps. The red (blue) colors present the region with high (low) coherency. The coherence power color bar indicates the power of coherence coefficients. The black contour presents the 5% significance level estimated from Monte Carlo Simulations.Back to article page