Although the fact is now mainly of historical interest, most larger-tube CRT PC monitors had a maximum horizontal scan rate of 70 kHz or higher, which means they could have handled 2048x1152 at 60 Hz progressive if set to use a custom resolution (with slimmer vertical blanking margins than HD-MAC/Eu95 itself for those rated for less than 75 kHz). Monitors able to support the lower refresh rate, including smaller models incapable of 70 kHz but good for at least 58 kHz (preferably 62.5 kHz) and able to support the lower vertical refresh rate could instead be set to run 50 Hz progressive, or even 100 Hz interlace to avert the flicker that would otherwise cause.