How to define energy spectrum of input particle

Dear all,
I saw from the book for application that geant4 can define energy spetrum using built-in function or user defined one. But how to can make it ? There is any example for defining energy spectrum? For example, I want a energy spectrum in the form as exponential function plus gauss function.

Hope you find this useful to define energy spectrum of input particles:

Hello. thanks for your advice.I will refer to the example: examples/extended/eventgenerator/exgps.

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