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. 2020 Oct 8;23(6):9139–9162. doi: 10.1007/s10668-020-01016-1

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© Springer Nature B.V. 2020

This article is made available via the PMC Open Access Subset for unrestricted research re-use and secondary analysis in any form or by any means with acknowledgement of the original source. These permissions are granted for the duration of the World Health Organization (WHO) declaration of COVID-19 as a global pandemic.

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Fig. 7 — Wavelet coherence (WTC) between COVID-19 confirmed case series with MaxT (a), MinT (b), DT (c), MT (d), WS (e), AP (f), RH (g) and AH (h). (The thick black cone-shaped contours show the 95% significance level, and the black line is the cone of influence. “→” denotes that the two series are in phase, while “←” means anti-phase relationship; “↓” indicates that the COVID-19 confirmed case series is ahead of the climatic indices, whereas “↑” means that the COVID-19 confirmed case series is lagged behind the climatic indices.)