<Li> Hannah Donaldson as Meg Hamilton </Li> <Li> Michael Moreland as Benny Ray </Li> <Table> <Tr> <Th_colspan="2"> Series </Th> <Th_colspan="2"> Episodes </Th> <Th_colspan="2"> Originally aired </Th> </Tr> <Tr> <Th> First aired </Th> <Th> Last aired </Th> </Tr> <Tr> <Td> </Td> <Td_colspan="1"> </Td> <Td_colspan="2"> </Td> <Td_colspan="1"> 10 March 2013 (2013 - 03 - 10) </Td> <Td> 11 March 2013 (2013 - 03 - 11) </Td> </Tr> <Tr> <Td> </Td> <Td_colspan="1"> </Td> <Td_colspan="2"> 6 </Td> <Td_colspan="1"> 11 March 2014 (2014 - 03 - 11) </Td> <Td> 15 April 2014 (2014 - 04 - 15) </Td> </Tr> <Tr> <Td> </Td> <Td_colspan="1"> </Td> <Td_colspan="2"> 6 </Td> <Td_colspan="1"> 15 January 2016 (2016 - 01 - 15) </Td> <Td> 4 March 2016 (2016 - 03 - 04) </Td> </Tr> <Tr> <Td> </Td> <Td_colspan="1"> </Td> <Td_colspan="2"> 6 </Td> <Td_colspan="1"> 13 February 2018 (2018 - 02 - 13) </Td> <Td> 20 March 2018 (2018 - 03 - 20) </Td> </Tr> </Table> <Tr> <Th_colspan="2"> Series </Th> <Th_colspan="2"> Episodes </Th> <Th_colspan="2"> Originally aired </Th> </Tr>

How many episodes are in series 4 of shetland