All disparity:
underscore _ (95 0x5f) vs. Q (81 0x51)
The top 25 disparities between the original kerning and Autokern's kerning, in descending order.
Original
The original kerning from the input.
underscore (0x5F) lsb: 36.0
underscore (0x5F) rsb: 36.0
underscore (0x5F) right x-extrema: 555.0
underscore (0x5F) x-advance: 591
Q (0x51) lsb: 33.0
Q (0x51) rsb: 14.0
underscore (0x51) right x-extrema: 342.0
Original kerning value: 0.000 em
Original kerned x-advance: 0.591 em
Original x-extrema offset: 0.068 em
Original in-ascender x-extrema overlap: None
Autokern
underscore (0x5F) lsb: 8.0
underscore (0x5F) rsb: 9.0
underscore (0x5F) right x-extrema: 527.0
underscore (0x5F) x-advance: 536
Q (0x51) lsb: 24.0
Q (0x51) rsb: 18.0
underscore (0x51) right x-extrema: 333.0
Autokern kerning value: -0.212 em
Autokern kerned x-advance: 0.324 em
Autokern x-extrema overlap: 0.180 em
Autokern in-ascender x-extrema overlap: None