All disparity:
thorn þ (254 0xfe) vs. underscore _ (95 0x5f)
The top 25 disparities between the original kerning and Autokern's kerning, in descending order.
Original
The original kerning from the input.
thorn (0xFE) lsb: 40.0
thorn (0xFE) rsb: 36.0
thorn (0xFE) right x-extrema: 299.0
thorn (0xFE) x-advance: 335
underscore (0x5F) lsb: 36.0
underscore (0x5F) rsb: 36.0
thorn (0x5F) right x-extrema: 555.0
Original kerning value: 0.000 em
Original kerned x-advance: 0.335 em
Original x-extrema offset: 0.072 em
Original in-ascender x-extrema overlap: None
Autokern
thorn (0xFE) lsb: 28.0
thorn (0xFE) rsb: 20.0
thorn (0xFE) right x-extrema: 287.0
thorn (0xFE) x-advance: 307
underscore (0x5F) lsb: 8.0
underscore (0x5F) rsb: 9.0
thorn (0x5F) right x-extrema: 527.0
Autokern kerning value: -0.126 em
Autokern kerned x-advance: 0.181 em
Autokern x-extrema overlap: 0.098 em
Autokern in-ascender x-extrema overlap: None