De pie and en pie are interchangeable in some contexts, including 'ponerse en/de pie'. However, estar and seguir en pie are preferred when used to mean 'standing' figuratively, while estar and seguir de pie are preferred when referring to a person's posture, i.e. standing on their feet.

-El público se puso de/en pie — The audience stood up

-El hombre estaba de pie junto a la ventana — The man was standing next to the window

-A las ocho ya estaba en pie — At 8 o'clock he was already up

-Yo seguía de pie en medio del salón — I was still standing in the middle of the living room

-La oferta sigue en pie — The offer still stands

-Ha sido un día duro, pero ya ves, sigo en pie — It's been a hard day, but I'm still standing, as you can see

-El edificio original sigue en pie — The original building still stands

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