All Figures

	Figure 1: The 5780 and 5797 diffuse bands in the spectrum of the heavily reddened star HD 168607 ( the top panel). The dots mark the continuum level used to measure the equivalent widths of 5780 and 5797 DIBs blended with broad ones: 5778 and 5795. We also compare our DIB equivalent width measurements with those of Herbig (1993) in the case of 5780 ( middle panel) and 5797 ( bottom).
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In the text

	Figure 2: Our measurements of the equivalent widths of the CH A-X feature compared to the already published ones of Megier et al. (2005) ( top panel). A similar comparison for the CN R(0) line at 3874 Å is given in the lower panel. Here the published data come from Palazzi et al. (1992) (circles) and Federman et al. (1994) (triangles). The (tight) correlation coefficients are shown in the plot.
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In the text

	Figure 3: The CN B-X system centered at 3875 Å in the radial velocity scale ( the top panel); the CH A-X feature near 4300.313 Å ( middle panel) and K I line at 7698.959 Å ( bottom panel) in the spectra of the same four heavily reddened stars. In the middle panel spectra of HD 154368, 165688, 166734, and 204827 are presented in a different order to avoid intersecting each other.
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In the text

	Figure 4: Correlation plot between equivalent widths of the CH A-X 4300 Å band and B-X 3886 Å. The stronger 4300 Å band saturates in the spectra of HD 147889, 165688, and 204827. (We also present the line which fits the data.)
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In the text

	Figure 5: A comparison of column densities determined in our sample with those from the publication of Federman et al. (1994). Small systematic differences are seen, but the values generally agree well. The correlation coefficients are equal to 0.94 and 0.97 in the case of CN and CH, respectively.
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In the text

	Figure 6: Correlation between column densities of CN and CH molecules. The relation is poor with a correlation coefficient equal to 0.63. The star HD 204827 with a high value (out of the plot range) of N(CN) = 34.00  1012 cm-2 is designated with an arrow.
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In the text

	Figure 7: Abundances of CH, CN molecules, strengths of 5797, 5780 DIBs correlated with E(B-V). The CH molecule and narrow 5797 DIB correlate very tightly. The correlation coefficients are given in the plot.
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In the text

	Figure 8: Correlation between column densities of CH and CN molecules divided by E(B-V) and intensity ratio of 5797 and 5780 DIBs. Correlation coefficients are equal to 0.56 and 0.49, respectively.
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In the text

Figure 9: Molecular column densities of the CH (at the top) and the CN molecule ( bottom) correlated with equivalent widths of the 5780 and 5797 DIBs. Both DIBs correlate better with CH rather than the CN molecule. The best correlation with the coefficient equal to 0.69 is observed between the methylidyne radical (the good H2 tracer) and the narrow 5797 DIB. Objects missing the ``main stream'' in the case of relation between column density of the CH molecule and the intensity of the 5797 DIB are plotted with circles. The relation in the case of the ``main stream'' (Fig. 9b) is plotted with dotted line.

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In the text