From the graph, estimate the bias (in ADUs per pixel) and the dark current (in ADUs per second per pixel). 7. Sample Mean Signal (Per Pixel) Exposure Time (seconds Dark 1 633.82 0.12 Dark 2 636.222 10 Dark 3 656.153 50 Dark 4 727.711 100 Dark 5 768.656 150 Dark 6 772.768 200 Dark 7 697.591 250 Dark 8 752.587 300 8. Mean Signal vs Exposure Time in Dark Samples 800 775 750 725 300 Mean Signal (Per Pixel) 675 650 625 600 0 25 50 75 100 125 150 175 200 225 250 275 300 325 Exposure Time (Seconds)