four (0x34) lsb: 12.0
four (0x34) rsb: 6.0
four (0x34) right x-extrema: 328.0
four (0x34) x-advance: 334
one (0x31) lsb: 12.0
one (0x31) rsb: 40.0
four (0x31) right x-extrema: 192.0
Original kerning value: 0.000 em
Original kerned x-advance: 0.334 em
Original x-extrema offset: 0.018 em
Original in-ascender x-extrema offset: 0.018 em
Autokern
four (0x34) lsb: 2.0
four (0x34) rsb: 12.0
four (0x34) right x-extrema: 318.0
four (0x34) x-advance: 330
one (0x31) lsb: 4.0
one (0x31) rsb: 28.0
four (0x31) right x-extrema: 184.0
Autokern kerning value: -0.022 em
Autokern kerned x-advance: 0.308 em
Autokern x-extrema overlap: 0.006 em
Autokern in-ascender x-extrema overlap: 0.006 em