一切都在标题中。 我的MWE是：
set term post eps color enhanced "Times-Roman" 18
set encoding utf8
a = 0.5
f(x) = a*x/(1 + a*x)
c(x) = 0.95
x1=38
set xrange [0:100]
set yrange [0:1.2]
set arrow 1 from x1,graph 0 to x1,f(x1) lt 2 lc 3 nohead
set label 1 at x1,graph 0 "{/Symbol q_1}" textcolor 3 offset 0.5,0.75
set label 2 at 0,0.95 "0.95" textcolor 7 offset -3.5,0
set output 'test-label.eps'
plot f(x) with line lw 2 lc 3 ,\
c(x) with line lw 2 lc 7
我想将\ theta_1用蓝色和0.95用红色，但是当我使用这段代码（我从gnuplot 5.0手册，第133页获得）时，我收到错误： colorspec选项无法识别
任何暗示欢迎