1. Standard system SD Free upper end. 1.1. Data group identifier SINGle RISEr SD 1.2. Boundary condition ZL ALFL ZL: real: Z-coordinate of lower end \(\mathrm {[L]}\) ALFU: real: Angle of lower end from vertical \(\mathrm {[deg]}\) If the lower end later in the specification is allowed to rotate freely around the Y-axis, ALFL will be dummy. 1.3. Line and line type LINE-ID LINTYP-ID LINE-ID: character(8): Line identifier LINTYP-ID: character(8): Reference to line type identifier If only 1 alphanumeric string is specified, the string is interpreted as LINTYP-ID. LINTYP-ID The LINE-ID is taken as the line number (=1) Numbering of supernodes: * ISNOD = 1 is lower end, (fixed) * ISNOD = 2 is upper end, (free) Next data group is Line and segment specification.