Table 1: Main observational properties of the dm radio spikes shorter than 100 ms, observed between February 2000 and December 2001 with the 15-m radio telescope and fast radiospectrograph of Torun Observatory. The drifts in frequency were calculated for spikes with inclined dynamic spectra only, vertical spectra were considered as having non-measurable drifts.

	2000						2001
	15 Mar.	26 Mar.	17 May	21 May	21 Jun.	11 Jul.	22 Mar.	23 Apr.	14 May	30 Oct.	all
No. of spikes	854	208	73	143	629	1403	174	576	876	392	5328
No. spikes <100 ms	817	156	62	143	597	1383	173	576	876	382	5165
Duration (s)
min/max	0.015/0.099	0.025/0.099	0.029/0.099	0.010/0.046	0.012/0.099	0.009/0.099	0.008/0.099	0.003/0.071	0.004/0.051	0.005/0.099	0.003/0.099
mean/median (skew.)	0.058/0.057 (0.2)	0.064/0.064 (0.6)	0.069/0.073 (-0.5)	0.02/0.018 (1.4)	0.046/0.041 (0.7)	0.029/0.024 (1.9)	0.037/0.032 (0.9)	0.026/0.023 (0.8)	0.015/0.013 (1.9)	0.047/0.046 (0.333)	0.036/0.029 (0.8)
Width (MHz):
min/max	3.1/18.9	4.2/20.4	3.6/17.9	3.1/26.4	3.8/35.5	3.1/31.4	3.1/26.7	3.0/23.8	3.0/34.5	3.1/25.9	3.0/35.5
mean/median (skew.)	8.19/7.9 (0.7)	9.69/9.5 (0.8)	9.96/9.8 (0.3)	10.07/9.2 (1.3)	11.36/10.6 (1.2)	10.43/9.5 (1.0)	10.19/9.5 (0.9)	8.47/8.2 (0.8)	9.97/9.0 (1.2)	12.30/12.0 (0.2)	10.0/9.2 (1.1)
Relative width (%)
min/max	0.21/1.31	0.29/1.40	0.25/1.23	0.23/1.92	0.27/2.47	0.21/2.42	0.22/1.88	0.21/1.65	0.21/2.42	0.22/1.82	0.21/2.47
mean/median (skew.)	0.58/0.56 (0.7)	0.68/0.66 (0.7)	0.70/0.67 (0.4)	0.72/0.66 (1.3)	0.80/0.74 (1.1)	0.74/0.68 (1.0)	0.72/0.69 (0.8)	0.60/0.58 (0.8)	0.70/0.64 (1.2)	0.87/0.86 (0.2)	0.70/0.65 (1.1)
Negative drifts (MHz/s)
No. spikes	642	140	49	49	437	212	122	430	253	344	2678
min/max	63/2630	92/1798	124/1007	261/5462	86/4976	64/3850	196/2595	69/12141	215/13569	113/5491	63/13569
mean/median (skew.)	396/312 (2.7)	307/239 (3.9)	301/206 (2.0)	1920/1484 (0.9)	630/501 (3.1)	1170/992 (0.7)	616/539 (2.6)	596/316 (6.4)	2607/2257 (2.1)	462/347 (6.9)	776/405 (4.4)
Positive drifts (MHz/s)
no. spikes	85	8	7	40	105	179	17	24	221	20	706
min/max	51/2444	218/872	87/1971	250/9102	116/2788	143/5155	111/1771	117/13425	242/9525	236/3624	51/13425
mean/median (skew.)	688/544 (1.5)	462/384 (0.5)	632/433 (1.3)	2837/2443 (1.1)	815/580 (1.5)	1219/1055 (1.3)	761/637 (0.3)	1752/719 (3.0)	2607/2415 (1.2)	1157/1195 (1.1)	1612/1105 (2.3)