Fix a fencepost / off-by-one error #1
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The `myfieldline` function previously produced an sequence of N datapoints, but N points describe a chain of only N-1 lines. This means the actual distance the field lines cover is `distance / N * (N - 1)` not `distance`.
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The
myfieldlinefunction previously produced an sequence of N datapoints, but N points describe a chain of only N-1 lines. This means the actual distance the field lines cover isdistance / N * (N - 1)notdistance.