Table 2: WRMS differences between the input catalogues and the ICRF before (Raw) and after approximation of the systematic differences (see notation of the methods in text). Results related to the LF method, providing the best approximation, are shown in bold. Unit: $\mu$ as.
AUS BKG DGFI JPL USNO GSFC MAO SHAO

$\Delta\alpha$

Raw 304 277 343 331 253 277 294 273

R 301 271 342 308 249 274 286 271

RD 299 265 342 308 247 273 285 270

B 170 177 237 238 172 191 203 193

LF 106 125 164 172 122 144 152 145

$\Delta\delta$

Raw 337 225 284 277 221 238 251 240

R 337 225 284 273 221 238 251 240

RD 333 224 283 273 221 237 251 239

B 180 159 178 182 152 158 169 166

LF 111 109 112 127 104 106 134 111

**Table 2:** WRMS differences between the input catalogues and the ICRF before (Raw) and after approximation of the systematic differences (see notation of the methods in text). Results related to the LF method, providing the best approximation, are shown in bold. Unit: $\mu$ as.
	AUS	BKG	DGFI	JPL	USNO	GSFC	MAO	SHAO
	$\Delta\alpha$
Raw	304	277	343	331	253	277	294	273
R	301	271	342	308	249	274	286	271
RD	299	265	342	308	247	273	285	270
B	170	177	237	238	172	191	203	193
LF	106	125	164	172	122	144	152	145
	$\Delta\delta$
Raw	337	225	284	277	221	238	251	240
R	337	225	284	273	221	238	251	240
RD	333	224	283	273	221	237	251	239
B	180	159	178	182	152	158	169	166
LF	111	109	112	127	104	106	134	111

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