NormRand←{                          ⍝ Random numbers with a normal distribution
   depth←10*9                           ⍝ randomness depth - can be larger from v14.0
   (x y)←⊂[1+⍳⍴,⍵](?(2,⍵)⍴depth)÷depth  ⍝ two random variables within ]0;1]
   ((¯2×⍟x)*0.5)×1○○2×y                 ⍝ Box-Muller distribution
}

code_colours

test script

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