Skip to main content
. Author manuscript; available in PMC: 2022 Oct 1.
Published in final edited form as: Environ Int. 2014 Apr 7;68:94–104. doi: 10.1016/j.envint.2014.03.019

Fig. 2.

Fig. 2.

Correlogram for elemental analysis by smoky and smokeless coals. Blue colour and upward sloping lines indicate positive correlation and red and downward sloping lines indicate negative correlations. Colour intensity indicates strength of correlation.