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def Ns(x, nd = 5): # round x to a given number of significant digits d = ceil(log(abs(x), 10)) return round(x, ndigits = -d + nd)

~~def Ns(x, nd = 5): # round x to a given number of significant digits d = ceil(log(abs(x), 10)) return round(x, ndigits = -d + nd)nd)~~