The solidus temperature corresponds to the beginning of the melting peak, and the liquidus temperature corresponds to the end of the melting peak. On the DSC curve, the solidus temperature is where the baseline starts to deviate due to the absorption of heat during the phase change from solid to liquid. The end of the peak represents the liquidus temperature.

In other words the solidus temperature is a specifies the temperature below which a material is completely solid therefor onset temperature of heating cycle will be solidus temperature i.e 109.55 degree C in attached DSC graph. on the other hand liquidus temperature specifies the temperature above which a material is completely liquid i.e. 124 degree C.