<Tr> <Td> Eckert II </Td> <Td> </Td> <Td> Pseudocylindrical </Td> <Td> Equal - area </Td> <Td> Max Eckert - Greifendorff </Td> <Td> 1906 </Td> <Td> </Td> </Tr> <Tr> <Td> Eckert IV </Td> <Td> </Td> <Td> Pseudocylindrical </Td> <Td> Equal - area </Td> <Td> Max Eckert - Greifendorff </Td> <Td> 1906 </Td> <Td> Parallels are unequal in spacing and scale; outer meridians are semicircles; other meridians are semiellipses . </Td> </Tr> <Tr> <Td> Eckert VI </Td> <Td> </Td> <Td> Pseudocylindrical </Td> <Td> Equal - area </Td> <Td> Max Eckert - Greifendorff </Td> <Td> 1906 </Td> <Td> Parallels are unequal in spacing and scale; meridians are half - period sinusoids . </Td> </Tr> <Tr> <Td> Ortelius oval </Td> <Td> </Td> <Td> Pseudocylindrical </Td> <Td> Compromise </Td> <Td> Battista Agnese </Td> <Td> 1540 </Td> <Td> <P> Meridians are circular . </P> </Td> </Tr>

What are the 3 types of map projections