four (0x34) lsb: 12.0
four (0x34) rsb: 6.0
four (0x34) right x-extrema: 328.0
four (0x34) x-advance: 334
seven (0x37) lsb: 4.0
seven (0x37) rsb: 12.0
four (0x37) right x-extrema: 276.0
Original kerning value: 0.000 em
Original kerned x-advance: 0.334 em
Original x-extrema offset: 0.010 em
Original in-ascender x-extrema offset: 0.010 em
Autokern
four (0x34) lsb: 2.0
four (0x34) rsb: 12.0
four (0x34) right x-extrema: 318.0
four (0x34) x-advance: 330
seven (0x37) lsb: 4.0
seven (0x37) rsb: 11.0
four (0x37) right x-extrema: 276.0
Autokern kerning value: -0.033 em
Autokern kerned x-advance: 0.297 em
Autokern x-extrema overlap: 0.017 em
Autokern in-ascender x-extrema overlap: 0.017 em