(Downloading may take up to 30 seconds.
If the slide opens in your browser, select File -> Save As to save it.)
Click on image to view larger version.

Fig. 5. The effects of chronic hypercapnia (CHC) (C,D) or control normocapnia (A,B)
on the breathing frequency response to acute hypercapnia in vivo with
the olfactory nerves intact (A,C) or denervated (B,D). The letters `a', `b'
and `c' indicate that the three values in each panel are significantly
different from one another. The asterisk in B indicates a significant
difference from the first air value (white bar).