london_MSLP_1692_2007.txt year,month,day,raw pressure,homogenized pressure,difference,filled code,holborn code, manley code FORMAT i4,2x,i2,2x,i2,2x,f6.1,2x,f6.1,2x,f4.1,2x,i1,2x,i1,2x,i1 Raw Pressure Pressure converted to temp, gravity, mslp etc Homogenized Pressure Pressure homogenized Difference Difference between raw pressure and homogenized pressure FILLED CODES 0 Not filled 1 Filled using linear interpolation of surrounding values 2 Filled using data from Heathrow airport (1981-2007) 3 Filled using observations from the Gentleman's Magazine (1782-3) 4 Filled using Cary's Observations (1826) HOLBORN CODE 0 Able to read value 1 Difficult to read value MANLEY CODE 0 Value not filled 1 Value filled by Manley using other data sources or interpolation