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<br />.. <br /> <br />. <br /> <br />~ <br /> <br />General commands used for either graphics software consist of two types: <br />a character and a symbol specification. Each specification consists of two <br />parts: the first part contains one a1phaeha1'aeter, either a "C" for character <br />or an "S" for symbol. The second part contains the applicable specification. <br />For characters (C), the second part is one character which may be anyone of <br />the 26 alphabetic letters as well as IIlOst special characters. For symbols <br />(S), the second part is a one or two digit nlllllber corresponding to a software <br />generated symbol. Typical valid nUlbers and their corresponding SYMbols <br />are shown in figure . As an eXIIIIP1e, if we wanted the character "." <br />plotted at each data point. the specification would be entered as: "C.". <br />Likewise, if we wanted to plot the syaGo1 "X" a.t each data point, we would <br />enter the specification: <br /> <br />"S12" <br /> <br />Similar in nature to the symbol specifications, the line specifications <br />consist of GCS oriented commands such as: HULL, LINE. DASHLINE, TICKLINE, <br />ALPHALINE. They also consist of commands that in one specification include <br />both the line type as well as specifications related to that line type similar <br />to the .C." or "S12" commands mentioned previously. The first part of the <br />line specification indicates the type of line: "D" for dash-line, "T" for <br />tick~line, and "A" for alpha-line. The second part of the line specification <br />consists of a specification for that particular type of line. For dash- <br />lines, it indicates the nature of the dash line, the length of the line <br />seglents and the length of the gapped segments. For ticked lines, it indicates <br />the length of the tick in the plus direction, the minus direction and the <br />distance between ticks. For alpha lines, it indicates the alphanumeric character <br /> <br />23 <br />