Figure 6
From: Stochastic Simulation of Delay-Induced Circadian Rhythms in Drosophila
Relative change of the mean values of periods and peaks of free dCLOCK (a) and total PER (b) after the value of one parameter increases or decreases by 20% of the standard value while other parameters are fixed. The relative change of the period is defined as 
, where 
is the mean of the period for the standard value of the parameter and 
is for the new value of the parameter. The relative change of the peaks is defined similarly.