Figure 3From: Gas emission during laparoscopic colorectal surgery using a bipolar vessel sealing device: A pilot study on four patientsPhotoacoustic absorption spectra of two different patients. The displayed photoacoustic absorption spectra originate from operations on two different patients (1 and 2). Striking differences were found in the absorption spectra between wavelengths of 890 to 905 cm-1.Back to article page