Table:
Indices	Exposure time (days)	Test groups
Control	Prometryne0.51 μg L−1	Prometryne0.144 mg L−1	Prometryne1.44 mg L−1
Hepatopancreas	11	4.018 ± 0.78	4.098 ± 0.59	1.695 ± 1.10*	1.065 ± 0.84*
25	3.953 ± 1.06	2.073 ± 0.69*	1.515 ± 0.60*	0.834 ± 0.40*
Muscle	11	0.121 ± 0.06	0.105 ± 0.04	0.106 ± 0.04	0.112 ± 0.07
25	0.150 ± 0.03	0.149 ± 0.02	0.116 ± 0.05	0.146 ± 0.04

Transform the table into Markdown format.

| <ROWSPAN=2> Indices | <ROWSPAN=2> Exposure time (days) | <COLSPAN=4> Test groups | 
 | Control | Prometryne0.51 μg L−1 | Prometryne0.144 mg L−1 | Prometryne1.44 mg L−1 | 
 | --- | --- | --- | --- | --- | --- | 
 | <ROWSPAN=2> Hepatopancreas | 11 | 4.018 ± 0.78 | 4.098 ± 0.59 | 1.695 ± 1.10* | 1.065 ± 0.84* | 
 | 25 | 3.953 ± 1.06 | 2.073 ± 0.69* | 1.515 ± 0.60* | 0.834 ± 0.40* | 
 | <ROWSPAN=2> Muscle | 11 | 0.121 ± 0.06 | 0.105 ± 0.04 | 0.106 ± 0.04 | 0.112 ± 0.07 | 
 | 25 | 0.150 ± 0.03 | 0.149 ± 0.02 | 0.116 ± 0.05 | 0.146 ± 0.04 |