Table 3: Parameters of collisions. The units of time and length are $250~{\mbox {Myr}}$ and $40~{\mbox {kpc}}$ , respectively.
Model N $\Delta t$ $\varepsilon$ $\frac{\Delta E}{E_0}$ , % $\frac{\Delta L}{L_0}$ , % Code

B01 40 960 1/256 0.001 14.53 0.06 GBSPH

B02 - 1/256 0.015 0.09 0.10 -

B03 - 1/256 0.025 0.14 0.40 -

B04 163 840 1/256 0.001 5.40 0.05 -

B05 - 1/256 0.010 0.11 0.10 -

B06 - 1/256 0.015 0.10 0.16 -

B07 491 520 1/256 0.001 2.17 0.07 -

B08 - 1/256 0.004 0.10 0.16 -

B09 - 1/256 0.010 0.09 0.11 -

B10 655 360 1/256 0.001 1.61 0.06 -

B11 - 1/256 0.008 0.07 0.08 -

B12 163 840 1/256 0.001 7.0 4.98 GADGET

B13 - 1/256 0.010 0.33 5.87 -

B14 - 1/256 0.015 0.27 4.98 -

B15 655 360 1/256 0.001 2.17 2.94 -

B16 - 1/256 0.008 0.11 2.33

**Table 3:** Parameters of collisions. The units of time and length are $250~{\mbox {Myr}}$ and $40~{\mbox {kpc}}$ , respectively.
Model	N	$\Delta t$	$\varepsilon$	$\frac{\Delta E}{E_0}$ , %	$\frac{\Delta L}{L_0}$ , %	Code
B01	40 960	1/256	0.001	14.53	0.06	GBSPH
B02	-	1/256	0.015	0.09	0.10	-
B03	-	1/256	0.025	0.14	0.40	-
B04	163 840	1/256	0.001	5.40	0.05	-
B05	-	1/256	0.010	0.11	0.10	-
B06	-	1/256	0.015	0.10	0.16	-
B07	491 520	1/256	0.001	2.17	0.07	-
B08	-	1/256	0.004	0.10	0.16	-
B09	-	1/256	0.010	0.09	0.11	-
B10	655 360	1/256	0.001	1.61	0.06	-
B11	-	1/256	0.008	0.07	0.08	-
B12	163 840	1/256	0.001	7.0	4.98	GADGET
B13	-	1/256	0.010	0.33	5.87	-
B14	-	1/256	0.015	0.27	4.98	-
B15	655 360	1/256	0.001	2.17	2.94	-
B16	-	1/256	0.008	0.11	2.33

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