Figure 7.8: X-ray colour - colour (hardness ratio) diagrams for EPIC PN detections

Figure 7.8: X-ray colour - colour (hardness ratio) diagrams for EPIC PN detections with likelihood values > 8 and summary quality flag > 0 restricted to detections with errors on the hardness ratios < 0.2. Top panels: HR2 vs HR1, bottom panels: HR3 vs HR2. Left panels: high Galactic latitude (|b| > 20) detections. Right panels: low Galactic latitude (|b| < 20) detections. The plots show the smoothed density of hardness ratio values in a logarithmic representation with contours overlaid.