Table 2: Results of fitting a circle centred on the star to the north-west quadrant (x>0, y>0) of the outer edge of the light echo of V838 Mon. Time of observations, $t_{\rm obs}$ , is in days since January 1, 2002. Results are in arcsec.
$t_{\rm obs}$ (days) $\theta$

120.0 $18.46\pm0.32$

140.0 $20.59\pm0.19$

245.0 $28.83\pm0.36$

301.0 $32.83\pm0.44$

351.0 $36.02\pm0.45$

**Table 2:** Results of fitting a circle centred on the star to the north-west quadrant (x>0, y>0) of the outer edge of the light echo of V838 Mon. Time of observations, $t_{\rm obs}$ , is in days since January 1, 2002. Results are in arcsec.
$t_{\rm obs}$ (days)	$\theta$
120.0	$18.46\pm0.32$
140.0	$20.59\pm0.19$
245.0	$28.83\pm0.36$
301.0	$32.83\pm0.44$
351.0	$36.02\pm0.45$

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