It has been shown in the paper that without doing the LTA (low temperature ashing, where organic matter of the coal is removed) SIROQUANT gives a good estimation of mineral matter in raw coal. The software has provision by which the background due to presence of non-crystalline material can be subtracted out. The slopes of the regression graphs are moderately high, which show the reliability of the software for direct quantification of mineral phases. Except A1_2O_3 (0.448), FeO has very high correlation coefficients (0.846) and SiO_2 (0.671). As noted on p. 510, 2nd column, 'The FeO regression graph gives low correlation coefficient due to one datapoint from SING-R coal, which is an outlier data with unknown reason. If we plot another regression graph for FeO with the remaining datapoints, R~2 increases to 0,846, which is quite high'.
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