\begin{table}%t1
\caption{\label{observations}Basic data of the observations of RR~Lyr.}
\small%\centering
\par
{\begin{tabular}{lccccc}
\hline
\hline\noalign{\smallskip}
Spectrum ID & HJD $-$ & Pulsational & Blazhko & SNR per  & Exposure \\       
number\tablefoottext{a}  & 2453000 & phase       & phase   & pixel\tablefoottext{b}  & time (s) \\
\hline
087	&	 183.7953   & 0.173 &  0.280 &  293 &   960.000    \\
088	&	 183.8147   & 0.207 &  0.281 &  250 &   960.000    \\
089	&	 183.8271   & 0.229 &  0.281 &  172 &   960.000    \\
091	&	 183.8441   & 0.260 &  0.281 &  149 &   960.000    \\
119	&	 184.7293   & 0.820 &  0.304 &  215 &   960.000    \\
120	&	 184.7434   & 0.846 &  0.305 &  253 &   960.000    \\
121	&	 184.7559   & 0.868 &  0.305 &  271 &   960.000    \\
122	&	 184.7683   & 0.890 &  0.305 &  194 &   960.000    \\
124	&	 184.7865   & 0.922 &  0.306 &  162 &   960.000    \\
125	&	 184.7988   & 0.943 &  0.306 &  126 &   960.000    \\
126	&	 184.8121   & 0.967 &  0.306 &  63  &   960.000    \\
158	&	 185.7401   & 0.604 &  0.330 &  101 &   960.000    \\
159	&	 185.7523   & 0.626 &  0.331 &  126 &   960.000    \\
160	&	 185.7645   & 0.647 &  0.331 &  171 &   960.000    \\
161	&	 185.7768   & 0.669 &  0.331 &  233 &   960.000    \\
163	&	 185.7937   & 0.698 &  0.332 &  232 &   960.000    \\
164	&	 185.8059   & 0.720 &  0.332 &  259 &   960.000    \\
165	&	 185.8182   & 0.741 &  0.332 &  113 &   960.000    \\
166	&	 185.8304   & 0.763 &  0.333 &  210 &   960.000    \\
168	&	 185.8465   & 0.792 &  0.333 &  228 &   960.000    \\
169	&	 185.8587   & 0.814 &  0.333 &  290 &   960.000    \\
170	&	 185.8709   & 0.834 &  0.334 &  236 &   960.000    \\
171	&	 185.8831   & 0.856 &  0.334 &  216 &   960.000    \\
173	&	 185.8989   & 0.885 &  0.334 &  236 &   960.000    \\
174	&	 185.9112   & 0.905 &  0.335 &  215 &   960.000    \\
175	&	 185.9234   & 0.928 &  0.335 &  233 &   960.000    \\
176	&	 185.9356   & 0.948 &  0.335 &  290 &   960.000    \\
178	&	 185.9512   & 0.977 &  0.336 &  357 &   960.000    \\
204	&	 186.7293   & 0.349 &  0.356 &  190 &   960.000    \\
205	&	 186.7425   & 0.372 &  0.356 &  138 &   960.000    \\
206	&	 186.7548   & 0.394 &  0.356 &  203 &   960.000    \\
207	&	 186.7670   & 0.416 &  0.357 &  46  &	960.000    \\
209	&	 186.7876   & 0.452 &  0.357 &  131 &   960.000    \\
210	&	 186.8007   & 0.475 &  0.358 &  77  &   960.000    \\
251	&	 187.7208   & 0.098 &  0.381 &  359 &   960.000    \\
252	&	 187.7330   & 0.120 &  0.382 &  319 &   960.000    \\
253	&	 187.7442   & 0.141 &  0.382 &  120 &   769.397    \\
255	&	 187.7632   & 0.173 &  0.382 &  124 &   960.000    \\
256	&	 187.7803   & 0.203 &  0.383 &  160 &   960.000    \\
257	&	 187.7923   & 0.226 &  0.383 &  87  &   797.949    \\
258	&	 187.8060   & 0.249 &  0.383 &  272 &   960.000    \\
{\bf 260}	&	 187.8226   & 0.278 &  0.384 &  322 &   960.000    \\
261	&	 187.8370   & 0.303 &  0.384 &  214 &   960.000    \\
262	&	 187.8504   & 0.327 &  0.385 &  288 &   960.000    \\
263	&	 187.8634   & 0.349 &  0.385 &  216 &   960.000    \\
319	&	 243.6989   & 0.854 &  1.824 &  27  &   960.000    \\
322	&	 243.7688   & 0.976 &  1.826 &  21  &   960.000    \\
323	&	 243.7832   & 0.002 &  1.826 &  18  &   960.000    \\
324	&	 243.7955   & 0.024 &  1.827 &  18  &   960.000    \\
326	&	 243.8123   & 0.053 &  1.827 &  21  &   960.000    \\
327	&	 243.8262   & 0.078 &  1.827 &  25  &   960.000    \\
328	&	 243.8395   & 0.101 &  1.828 &  13  &   960.000    \\
363	&	 244.6062   & 0.454 &  1.847 &  231 &   960.000    \\
364	&	 244.6201   & 0.478 &  1.848 &  251 &   960.000    \\
365	&	 244.6323   & 0.500 &  1.848 &  258 &   960.000    \\
366	&	 244.6445   & 0.521 &  1.848 &  238 &   960.000    \\
368	&	 244.6622   & 0.553 &  1.849 &  249 &   960.000    \\
369	&	 244.6744   & 0.574 &  1.849 &  181 &   960.000    \\
370	&	 244.6870   & 0.596 &  1.849 &  173 &   960.000    \\
371	&	 244.6992   & 0.618 &  1.850 &  171 &   960.000    \\
373	&	 244.7168   & 0.648 &  1.850 &  152 &   960.000    \\
374	&	 244.7290   & 0.670 &  1.851 &  122 &   960.000    \\
375	&	 244.7412   & 0.693 &  1.851 &  90  &   960.000    \\
376	&	 244.7535   & 0.713 &  1.851 &  69  &   960.000    \\
\hline	 
\end{tabular}}
\tablefoot{\tablefootmark{a}{The spectra number 253 and 257 have a lower exposure time, because the 
observation was stopped due to the presence of thick clouds. 
Spectrum number {\bf 260} is the one analyzed in detail in this paper.}
\tablefootmark{b}{Calculated at $\sim$5000~\AA.}} 
\end{table}