Before revision:  The CG247X's response times depended on both source and destination luminance . Despite this nonlinear behaviour, we were able to define a contrast and frequency range wherein the CG247X was artifact-free , that is, the relationship between nominal luminance and displayed luminance was accurately modelled using a causal, linear time-invariant system.
After revision:  The CG247X's response times depended on both the luminance from which, and to which, it responded, as is to be generally expected from LCDs . Despite this nonlinear behaviour, we were able to define a contrast and frequency range wherein the CG247X was artifact-free , that is, the relationship between nominal luminance and displayed luminance was accurately modelled using a causal, linear time-invariant system.