Read spherical harmonic coefficients and associated errors from an ascii-formatted file.

## Usage

`cilm`

, `error`

, `lmax`

= SHReadError (`filename`

, `lmaxin`

, [`skip`

])

## Returns

`cilm`

: float, dimension (2,`lmaxin`

+1,`lmaxin`

+1)- The spherical harmonic coefficients contained in
`filename`

. Note that dimensions of the output array are determined by`lmaxin`

, and not the output`lmax`

. `error`

: float, dimension (2,`lmaxin`

+1,`lmaxin`

+1)- The errors of the spherical harmonic coefficients contained in
`filename`

. Note that dimensions of the output array are determined by`lmaxin`

, and not the output`lmax`

. `lmax`

: integer- The maximum spherical harmonic degree of
`cilm`

. This is the minimum of the maximum spherical harmonic degree of`filename`

and the dimension of`cilm`

-1.

## Parameters

`filename`

: character(:)- The filename of the ascii file containing the spherical harmonic coefficients.
`lmaxin`

: integer- This spherical harmonic degree controls the dimension of the output array
`cilm`

. The coefficients between`lmax+1`

and`lmaxin`

will be set to zero. `skip`

: optional, integer, default = 0- The number of lines to skip before parsing
`filename`

.

## Description

`SHRead`

will read spherical harmonic coefficients from an ascii-formatted file into an array `cilm`

. The maximum spherical harmonic degree that is read is determined by the minimum of the dimension of the input array `cilm`

-1 and the maximum degree of the coefficients in the file. If the optional array `skip`

is specified, parsing of the file will commence after the first `skip`

lines.

The spherical harmonic coefficients in the file are assumed to be ordered by increasing degree `l`

and angular order `m`

according to the format

`l, m, cilm[0,l,m], cilm[1,l,m]`

The ordering of the file is explcitly given by

`l, 0 / l, 1 / l, 2 /l, ... / l, m / l+1, 0 / l+1, 1 / ...`

The first spherical harmonic degree of the filename does not have to be 0; this is determined from the first element after the `skip`

and `header`

lines.

## See also

shread, shreadh, shreaderrorh, shread2, shread2error, shreadjpl shreadjplerror

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