Pattern format
The common MIL-STD-150A format consists of six groups in a compact spiral arrangement of three layers. The largest two groups, forming the first layer, are located on the outer sides. The smaller layers consist of repeating progressively smaller pairs toward the center. Each group consists of six elements, numbered from 1 to 6. Within the same layer, the odd-numbered groups appear contiguously from 1 through 6 from the upper right corner. The first element of the even-numbered groups is at the lower right of the layer, with the remaining 2 through 6, at the left. The scales and dimensions of the bars are given by the expression : \text{resolution (lp/mm)} = 2^{\text{group} + (\text{element} - 1)/6}, although usually the following lookup table will be more convenient to use. The line pair (lp) means a black and a white line. ToString[First[#2 <> " || " <> StringJoin[Riffle[#1, " || " <> "\n" &; makeColumn = StringTrim @ StringJoin[Riffle[#, "|-\n"&; vals = Table[NumberForm[N[500/x[g, e, {Infinity, 2 + Boole[g 4]}], {e, 6}, {g, -2, 9}]; makeColumn[MapIndexed[makeRow, Map[ToString, vals, {2}] --> ToString[First[#2 <> " || " <> StringJoin[Riffle[#1, " || " <> "\n" &; makeColumn = StringTrim @ StringJoin[Riffle[#, "|-\n"&; vals = Table[NumberForm[N[x[g, e, {Infinity, 2}], {e, 6}, {g, -2, 9}]; makeColumn[MapIndexed[makeRow, Map[ToString, vals, {2}] --> == Images ==