**Table 2:** Line widths of the Mg X $2{\rm s}~^2{\rm S}_{1/2}-2{\rm p}~^2{\rm P}_{1/2,3/2}$ doublet for selected height ranges in an equatorial region.
Range	${\it\Delta} \lambda_{\rm FWHM}^{a}$ /pm		${\it\Delta} \lambda_{\rm D}^{b}$ /pm
h/Mm	$^2{\rm P}_{3/2}$	$^2{\rm P}_{1/2}$	$^2{\rm P}_{3/2}$	²P_1/2
-45 to -30	15.29	14.37	8.36	7.74
-30 to -15	16.22	14.97	8.97	8.14
-15 to 0	16.67	15.01	9.26	8.17
0 to 15	16.69	14.93	9.27	8.12
5 to 30	16.86	15.23	9.38	8.32
21 to 56	16.15, 15.18	17.05, 15.72	7.71^c	8.24^c
56 to 91	16.56, 15.42	17.28, 16.36	7.95^c	8.55^c
91 to 127	17.42, 16.63	17.99, 17.01	8.70^c	9.04^c
127 to 163	17.94, 16.76	18.51, 17.87	8.93^c	9.52^c
163 to 198	18.11, 17.02	18.46, 17.87	9.08^c	9.50^c
198 to 234	19.15, 17.36	18.29, 18.15	9.56^c	9.54^c

^a Estimated relative standard uncertainty 4%.
^b A direct conversion of the measured width, ${\it\Delta }\lambda _{\rm FWHM}$ , to ${\it\Delta} \lambda_{\rm D}^*$ (without corrections for the instrumental width) can be obtained with Eq. (1). It would give, for instance, ${\it\Delta} \lambda_{\rm D}^* = 9.18$ pm and 8.63 pm in the first data row of the table.
^c Mean value.

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