请那位高手帮我解释以下程式的意思
%HEADERNAME=PD1642BA.F14
MACHINE=MSH3
MNAME=
CREATE=2008/03/23
REVISE=2008/03/23
SETUP=DD1642BA.F14
BOARD=CD1642BA.F14
TYPE=ABS
BLOCK=00131
MLSTEP=00001
PANASONIC=1100
COMMENT=
%POFFSET
X-21570Y-4260F1;
%NCDATA
N1X0Y0W0Z1PN()C()M20T0/0;
N2X-43529Y-31W0Z1PN()C()M20T0/0; ?
N3X-87029Y-39W0Z1PN()C()M20T0/0; ?
N4X-130506Y-119W0Z1PN()C()M20T0/0; ?
N5X-173996Y-99W0Z1PN()C()M20T0/0; ?
N6X0Y0W0Z1PN()C()M100T0/0;
N7X-15390Y136970W270Z1PN()C(R611 )M0T0/0;(其中:P、T、/、代表什么?)
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%MARKLAND
N6M1(-224240,150090,C1.0 )M2(-4320,16010,C1.0 )L1(0,0)L2(0,0)L3(0,0)L4(0,0)L5(0,0)L6(0,0)L7(0,0)L8(0,0)(这一句又是表示什么?特别是L1、L2、L3、L4…?)
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