// Get the focused Sequence
seq = getSequence()
if (seq == null) throw "Please open a sequence first."
seq.setPixelSizeX(12) // 12 ?m for X and for Y
seq.setPixelSizeY(12) // (supposedly, same value along X and Y)
seq.setPixelSizeZ(10) // 10 ?m between two stacks
seq.setTimeInterval(0.4) // 400 s between time points