That's how you want it to look, it hard clips at the peak luminance supported by your display. This page, selecting the HDR Contrast setting, is important for HDR, and you have to determine the best setting yourself. I'd start with Contrast at max 50, and measure the whole curve. If it's like the Q90R, the measured values (white line) will be a fair bit higher than the target values (yellow line) in the right half of the curve. You want to incrementally lower Contrast and re-measure the whole curve as you go. It's a good idea to use the History tabs for this; for each new Contrast value, click the + sign next to the current History tab to get a new one, so that you can retain measurements for each Contrast value you try. (You can right-click on a History tab to rename it, so you can keep track of which Contrast value was used for it.) Keep lowering Contrast until you start seeing measured values (white line) that are noticeably less than the target values (yellow line) somewhere on the curve, probably in the 5-15% range. Probably you want to measure from 50 down to 40 or so. Then the hard part is to pick the Contrast value that has the best fit of measured curve to target curve. If there are a few Contrast values that all seem they might be good, then you might want to complete separate Autocal runs for each one of them, to see which one ends up with a better overall calibration at the end. Once you've settled on a good Constrast value, you probably don't have to go through this whole thing again, you can just use that value for future calibrations.yes my auto cal brings up the eotf. How does the work? It seems that my curve flat lines at the top of curve?