Distributions of the Si IV 1394 Å line core (rest wavelength) intensity for the five datasets studied here. Large panels: Histograms of the intensity for each pixel within the rasters studied here (black bars), as well as the intensity only at locations where IRIS burst profiles were detected (red bars). Small panels: Same as above but with the y-axis scaled to better display the red bars. Clearly, IRIS burst profiles were not confined to only the brightest pixels in the FOVs.