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. 2020 Sep 4;414:132704. doi: 10.1016/j.physd.2020.132704

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Since January 2020 Elsevier has created a COVID-19 resource centre with free information in English and Mandarin on the novel coronavirus COVID-19. The COVID-19 resource centre is hosted on Elsevier Connect, the company's public news and information website. Elsevier hereby grants permission to make all its COVID-19-related research that is available on the COVID-19 resource centre - including this research content - immediately available in PubMed Central and other publicly funded repositories, such as the WHO COVID database with rights for unrestricted research re-use and analyses in any form or by any means with acknowledgement of the original source. These permissions are granted for free by Elsevier for as long as the COVID-19 resource centre remains active.

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Fig. A.1 — (1st row) Binary maps of a CoV particle with varying ROIs: (left panel) 115 × 115 pixels, and (right panel) 125 × 125 pixels. The corresponding log–log plots of box size versus number of boxes (2nd row). The slope of the fitted straight line gives the D value, expressed as mean $\pm$ SD. Note a slight improvement in the fit with a change in ROI, as seen from the plot shown in right. The units of variables used are arbitrary.