Gcm⁡(z,h)∼sinh⁡zcosh2⁡z⁢(s2+325⁢h+129⁢h2⁢(s3+3⁢s+4⁢s3+44⁢scosh2⁡z)+1214⁢h3⁢(5⁢s4+34⁢s2+9-s6-47⁢s4+667⁢s2+283512⁢cosh2⁡z+s6+505⁢s4+12139⁢s2+1039512⁢cosh4⁡z))+⋯.