Figure 4
From: In vivo sub-femtoliter resolution photoacoustic microscopy with higher frame rates
The green spots represent 1PA signals, demodulated at 0.5 MHz and the red spots stand for 2PA signals, demodulated at 1 MHz.
In addition, the hollow spots represent photoacoustic signals without compensation and the solid spots indicate signals with compensation. Reference lines (black dashed lines) with fitted slopes are given. a, fitted power dependence slope; R2, R-squared value of linear regression.
