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the corresponding Digital Signature has an identical name, appended with .SIG. 5.2. So, to verify the SIGWX PNG file for area ‘B’ valid at 0600 UTC (issued by WAFC London) the system should extract PGSE05_EGRR_0600.PNG from path /SIGWX_PNG/SWH_PNG/AREA_B. This process simply extracts the raw data