Letters And Numbers disparity:
four.sub (None) vs. napostrophe ʼn (329 0x149)
The top 25 disparities between the original kerning and Autokern's kerning, in descending order.
Original
The original kerning from the input.
four.sub (None) lsb: 20.0
four.sub (None) rsb: 40.0
four.sub (None) right x-extrema: 386.0
four.sub (None) x-advance: 426
napostrophe (0x149) lsb: 69.0
napostrophe (0x149) rsb: 17.0
four.sub (0x149) right x-extrema: 689.0
Original kerning value: 0.000 em
Original kerned x-advance: 0.426 em
Original x-extrema offset: 0.109 em
Original in-ascender x-extrema offset: 0.190 em
Autokern
four.sub (None) lsb: -18.0
four.sub (None) rsb: 1.0
four.sub (None) right x-extrema: 348.0
four.sub (None) x-advance: 349
napostrophe (0x149) lsb: -19.0
napostrophe (0x149) rsb: 2.0
four.sub (0x149) right x-extrema: 601.0
Autokern kerning value: -0.138 em
Autokern kerned x-advance: 0.211 em
Autokern x-extrema overlap: 0.156 em
Autokern in-ascender x-extrema overlap: 0.075 em