the metric value with the APS and the CPS. The metric is measured every 2 min observation, and]{} the metric of 63 observations, used in this work, is known. ]{}

[ In Fig. \[fig:IonoA\], we show the ionosphere metric dependence of the APS at 167.675 MHz and 197.115 MHz, and at $l$=100 and 500. The colour of dots represents pointing of observation as with the Fig. \[fig:APSLST\]. The metric of ionosphere does not have apparent correlation even with active ionosphere, $m>10$. Furthermore, APS with quiet ionosphere, $m<4$, and moderate, $4<m<10$, do not have particular dependence on $m$. This indicates that contamination due to ionosphere is smaller than the foreground residuals such as fainter point sources and diffuse foregrounds. On the other hand, pointing is a crucial systematic on the APS. As shown in right panels, the blue dots are stronger than others which is also indicated from Fig. \[fig:APSLST\]. ]{}

[ In addition, the ionosphere effect on the CPS is shown in Fig. \[fig:IonoX\], and also there is no apparent correlation between CPS and $m$. In the plot, we show the averaged CPS of quiet, moderate and active ionospheres with the standard deviation as error bars. The averaged CPS with 