**Table 2:** Line flux ratios in TW Hya (notation as in Fig. 1).
$\lambda\lambda$	Flux ratio	av^a	$\lambda\lambda$	Flux ratio	av^a
M2/3G	$0.57~\pm~0.16$	0.9	3D/3F	$1.42~\pm~0.46$	0.6
3G/3F	$2.43~\pm~0.76$	1.3	3G/3C	$1.06~\pm~0.26$	0.8
M2/3F	$1.39~\pm~0.48$	1.2	3G/3D	$1.71~\pm~0.43$	2.1
3D/3C	$0.62~\pm~0.16$	0.4	3F/3C	$0.43~\pm~0.19$	0.6
O( $\beta/\alpha$ )	$0.18~\pm~0.03$	0.14	Ne( $\beta/\alpha$ )	$0.13~\pm~0.02$	0.14

^a Error-weighted average of stellar measurements.

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