Fig. 4
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Increasing Std spectra for coal samples from Ales (A23), Saint-Etienne (SCM1) and Sarro-Lorrain (GIR 3610) coalfields. After a considered carbonisation process (pyrolysis for A23, pit-fire for SCM1 and thermal degradation during burial for GIR 3580), decreasing Std spectra are well evidenced. Colour codes (accompanied by specified symbols) are referred to Figure 3.
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