Solar corona data format (up to June 1957)

1-4	Year
6-7	Month
9-13	Day (with fractional part)

Data in line 5303 Angstroem:
15-17	Latitude of the radiation center (999=no data)
18	Limb (E=east, W=west)
20-21	Basis of the luminous zone, in degrees (99=no data)
23	Brightness in 6-grade scale,
	or 0 (brightness is below threshold),
	or 9 (no data)

Data in line 6374 Angstroem:
25-27	Latitude of the radiation center (999=no data)
28	Limb (E=east, W=west)                         
30-31	Basis of the luminous zone, in degrees (99=no data)       
33	Brightness in 6-grade scale,                
	or 0 (brightness is below threshold),         
	or 9 (no data)