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Fig. 1. Experimental setup used to simultaneously record CO2 emission
and visualize internal tracheal compression of the carabid beetle
Pterostichus stygicus. Multiple locations in the body were recorded;
x-ray movie stills here show tracheal tubes in the mesothorax between first
and second coxae (large circular cuticular joints). The blue arrow indicates
the location where we digitized the primary tube depicted in
Fig. 3. Field of view is 3.2
mmx2.4 mm. In the schematic diagram, legs are not depicted for clarity,
but were tucked to the side of the beetle.
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