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What tools (hardware & software) were used to create the image of the FT8 signal (more specifically FT8.png)?

The main page states: "Most signals are received and recorded using a software defined radio such as the RTL-SDR, Airspy, SDRPlay, HackRF, BladeRF, Funcube Dongle, USRP or others." But the resolution, in both the time and frequency axes shown in FT8.png, is higher by perhaps an order of magnitude than what I've seen with either WSJT-X or SDRplay. I'm guessing this was done with some kind of lab equipment, but please point me in the right direction if this level of detail is available via common SDR software. I'd love to observe my Tx signal at this resolution.

Forgive me if answered elsewhere, but I didn't see anywhere after a quick look around.

Thanks in advance, 73, Bennett WB5GVY