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`tense(`

`x`, `y`, `xf` [, `tension`][, `dlhs`,
`drhs`])

Interpolates functions using splines under tension, and returns the
y-coordinates of the interpolated points. The input points have
coordinates `(`

(`x`, `y`)`array`

s), and

must be in ascending order. The interpolation is
performed at x coordinates `x`

. `xf`

governs the tenseness of the interpolation curve. It defaults to 1 and
must not be smaller. `tension`

and `dlhs`

are the
desired first derivatives at the left-hand and right-hand sides,
respectively.
`drhs`

See also: tense_curve, `tense_loop`