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import numpy as np
import scipy.integrate as integrate
def dist_proper(coord, gXX):
"""
Calculate proper distance along given spatial axis.
:param array_like coord: 1D array of spatial coordinates.
:param array_like gXX: Values of the XX component of the spatial metric at
provided coordinates.
:return: array of proper distances from coord[0].
"""
return integrate.cumulative_trapezoid(np.sqrt(gXX), coord, initial = 0.0)
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