Write spherical harmonic coefficients to a text file formatted as [degree, order, value].

## Usage

```
write_dov(filename, coeffs, [errors, header, header2, lmax])
```

## Parameters

**filename : str**- File name of the ‘dov’-formatted spherical harmonic coefficients. If filename ends with ‘.gz’ the file will be automatically compressed with gzip.
**coeffs : ndarray, size(2, lmaxin+1, lmaxin+1)**- The spherical harmonic coefficients.
**errors : ndarray, size(2, lmaxin+1, lmaxin+1), optional, default = None**- The errors associated with the spherical harmonic coefficients.
**header : str, optional default = None**- A string to be written directly before the spherical harmonic coefficients.
**header2 : str, optional default = None**- A second string to be written directly before the spherical harmonic coefficients.
**lmax : int, optional, default = None**- The maximum spherical harmonic degree to write to the file.

## Notes

This function will write spherical harmonic coefficients (and optionally the errors) to a text file formatted as [degree, order, value]. If header or header2 are specified, these strings will be written first, directly before the spherical harmonic coefficients. Both real and complex spherical harmonic coefficients are supported.

The spherical harmonic coefficients in the file will be formatted as pairs of lines as

l, m, coeffs[0, l, m] l, -m, coeffs[1, l, m]

where l and m are the spherical harmonic degree and order, respectively. If the errors are included, each pair of lines will be formatted as

l, m, coeffs[0, l, m], errors[0, l, m] l, -m, coeffs[1, l, m], errors[1, l, m]

For each value of increasing l, all the angular orders are listed in inceasing order, from 0 to l.

If the filename ends with ‘.gz’, the file will be automatically compressed using gzip.

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