help understand these charts.

Hi all,
following are different THD+N measurements of random two different brands of amplifier taken from website audio.pl. Being Distortion + noise measurements I am curious what makes one chart having THD+N higher than other at 0.1watt. At such low level what contributes more to higher level (shown in green circle) noise or distortion ? Both amps are (Emotiva and Denon) class AB and more or less same power

sample 1.jpg


sample 2.jpg


thanks and regards