four (0x34) lsb: 37.0
four (0x34) rsb: 37.0
four (0x34) right x-extrema: 563.0
four (0x34) x-advance: 600
seven (0x37) lsb: 27.0
seven (0x37) rsb: 57.0
four (0x37) right x-extrema: 387.0
Original kerning value: 0.000 em
Original kerned x-advance: 0.600 em
Original x-extrema offset: 0.064 em
Original in-ascender x-extrema offset: 0.064 em
Autokern
four (0x34) lsb: -6.0
four (0x34) rsb: -1.0
four (0x34) right x-extrema: 520.0
four (0x34) x-advance: 519
seven (0x37) lsb: -2.0
seven (0x37) rsb: 14.0
four (0x37) right x-extrema: 358.0
Autokern kerning value: -0.070 em
Autokern kerned x-advance: 0.449 em
Autokern x-extrema overlap: 0.073 em
Autokern in-ascender x-extrema overlap: 0.073 em