Read spherical harmonic coefficients and associated errors from an ascii-formatted file with a header line.

## Usage

cilm, error, lmax, header = SHReadErrorH (filename, lmaxin, nhead, [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.
header : float, dimension (nhead)
Array of the first nhead values in the file’s initial header line.

## 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.
nhead : integer
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.