AFAIK
!st seg: 35ft HAT, 1EO, T/O thrust, T/O flap, gear retracting, ends with gear up
2nd seg: gear up, 1EO, T/O thrust, T/O flap, scheduled min gradient, ends 400ft HAT
3rd seg: gear up, 1EO, T/O thrust, flaps retracting, pos gradient, ends flap up
4th seg: 1EO, clean, T/O thrust, accelerate to enroute climb speed, pos gradient
Gradients depend on number of engines, T/O thrust time limits may intrude and escape procedures may modify heights. 2nd seg may end at different HAT in certain regulatory jurisdictions.