No curve for 60W. Yes, I measured that myself. I had to videotape the wattage meter and take readings over time when I played back the video. It's a bit crude, but illustrates the point.
Just an FYI, even at 100 watts, it's only for the first fifteen minutes, then the charging cradle will start throttling down the input wattage. This is for a battery discharged to 5%.