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Convert vector from spherical basis components to Cartesian components

`vr = sph2cartvec(vs,az,el)`

converts
the components of a vector or set of vectors, `vr`

= sph2cartvec(`vs`

,`az`

,`el`

)`vs`

,
from their *spherical basis representation* to
their representation in a local Cartesian coordinate system. A spherical
basis representation is the set of components of a vector projected
into the right-handed spherical basis given by $$({\widehat{e}}_{az},{\widehat{e}}_{el},{\widehat{e}}_{R})$$.
The orientation of a spherical basis depends upon its location on
the sphere as determined by azimuth, `az`

, and
elevation, `el`

.

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