Spectra of different regions used for the measurement of carbon. Top panel shows part of the CH region at ~4300Å (G-band), middle panel shows the C₂ band, and lowest panel shows the CH band (A-X system) at ~4850 Å. In all cases, solid red lines show best fits of the regions (as listed in the text), dashed blue lines show carbon values ±0.20 from that fit, and solid gray lines show how the spectrum would look without any carbon. Note that the scale on the y-axis is not the same for all panels.