Plot spectrum from 2D fit
plot_sparse_2d(
fit_data,
tables = NULL,
spec_idx = 1,
spec_int = NULL,
col_model = 2,
col_nucleus = NULL,
lwd = 1,
tick_spacing = 0.02,
coupling_spacing = 0.01,
coupling_marks = 0.009,
xaxs = "i",
yaxs = "i",
low_frac = 0.05,
bty = "n",
always_show_start = FALSE,
add = FALSE,
ppm_map_list = NULL
)