Figure 6: Mean peak latency values ad standard errors (S. E.) of target-related CN as obtained from the differences between the incongruent and congruent flankers conditions as a function of pre-cueing types, namely, NC = No Cue; CC = Center Cue; 2C = Double cue; LC = Local Cue validly informative of target spatial location.
From: How voluntary orienting of attention and alerting modulate costs of conflict processing

Note that the values were computed starting from cue appearance, that is, 500 ms before target delivery.